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1221221220310 = 257131342001341
BaseRepresentation
bin10001110001010110011…
…101001111111111010110
311022202012000011210120001
4101301112131033333112
5130002030113022220
62333004333001514
7154142000046010
oct21612635177726
94282160153501
101221221220310
11430a0a5a5aa3
1217882062329a
138b211ca67c0
1443170aa51b0
1521b77c8480a
hex11c5674ffd6

1221221220310 has 32 divisors (see below), whose sum is σ = 2705474705472. Its totient is φ = 386496385920.

The previous prime is 1221221220281. The next prime is 1221221220313. The reversal of 1221221220310 is 130221221221.

It is a super-2 number, since 2×12212212203102 (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221220313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670999761 + ... + 671001580.

It is an arithmetic number, because the mean of its divisors is an integer number (84546084546).

Almost surely, 21221221220310 is an apocalyptic number.

1221221220310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221221220310 is an abundant number, since it is smaller than the sum of its proper divisors (1484253485162).

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

1221221220310 is a wasteful number, since it uses less digits than its factorization.

1221221220310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342001368.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1221221220310 its reverse (130221221221), we get a palindrome (1351442441531).

The spelling of 1221221220310 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, three hundred ten".

Divisors: 1 2 5 7 10 13 14 26 35 65 70 91 130 182 455 910 1342001341 2684002682 6710006705 9394009387 13420013410 17446017433 18788018774 34892034866 46970046935 87230087165 93940093870 122122122031 174460174330 244244244062 610610610155 1221221220310