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1221031230 = 23552178121
BaseRepresentation
bin100100011000111…
…0111010100111110
310011002120210221220
41020301313110332
510000040444410
6321054534210
742154410546
oct11061672476
93132523856
101221031230
11577270921
122a0b07366
13165c790b3
14b8246326
15722e2070
hex48c7753e

1221031230 has 32 divisors (see below), whose sum is σ = 2936137248. Its totient is φ = 324979200.

The previous prime is 1221031211. The next prime is 1221031241. The reversal of 1221031230 is 321301221.

1221031230 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23431 + ... + 54690.

It is an arithmetic number, because the mean of its divisors is an integer number (91754289).

Almost surely, 21221031230 is an apocalyptic number.

1221031230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221031230 is an abundant number, since it is smaller than the sum of its proper divisors (1715106018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221031230 is a wasteful number, since it uses less digits than its factorization.

1221031230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78652.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1221031230 is about 34943.2572894972. The cubic root of 1221031230 is about 1068.8307109116.

Adding to 1221031230 its reverse (321301221), we get a palindrome (1542332451).

The spelling of 1221031230 in words is "one billion, two hundred twenty-one million, thirty-one thousand, two hundred thirty".

Divisors: 1 2 3 5 6 10 15 30 521 1042 1563 2605 3126 5210 7815 15630 78121 156242 234363 390605 468726 781210 1171815 2343630 40701041 81402082 122103123 203505205 244206246 407010410 610515615 1221031230