Search a number
-
+
21311221403 = 1760113211579
BaseRepresentation
bin10011110110001111…
…110110111010011011
32001000012211012212102
4103312033312322123
5322121133041103
613442405234015
71353053251553
oct236617667233
961005735772
1021311221403
1190466a107a
12416910290b
1320182413a4
1410624c8163
1584ae25e88
hex4f63f6e9b

21311221403 has 16 divisors (see below), whose sum is σ = 22633803360. Its totient is φ = 19996416000.

The previous prime is 21311221397. The next prime is 21311221441. The reversal of 21311221403 is 30412211312.

It is a cyclic number.

It is not a de Polignac number, because 21311221403 - 210 = 21311220379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311221453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13495868 + ... + 13497446.

It is an arithmetic number, because the mean of its divisors is an integer number (1414612710).

Almost surely, 221311221403 is an apocalyptic number.

21311221403 is a deficient number, since it is larger than the sum of its proper divisors (1322581957).

21311221403 is a wasteful number, since it uses less digits than its factorization.

21311221403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21311221403 its reverse (30412211312), we get a palindrome (51723432715).

The spelling of 21311221403 in words is "twenty-one billion, three hundred eleven million, two hundred twenty-one thousand, four hundred three".

Divisors: 1 17 601 1321 1579 10217 22457 26843 793921 948979 2085859 13496657 16132643 35459603 1253601259 21311221403