21231231110231 has 16 divisors (see below), whose sum is σ = 21615115392000. Its totient is φ = 20850294392928.

The previous prime is 21231231110161. The next prime is 21231231110233. The reversal of 21231231110231 is 13201113213212.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21231231110231 is a prime.

It is a super-2 number, since 2×21231231110231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231231110197 and 21231231110206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231231110233) 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, 47996141 + ... + 48436473.

It is an arithmetic number, because the mean of its divisors is an integer number (1350944712000).

Almost surely, 2^{21231231110231} is an apocalyptic number.

21231231110231 is a deficient number, since it is larger than the sum of its proper divisors (383884281769).

21231231110231 is a wasteful number, since it uses less digits than its factorization.

21231231110231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443678.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21231231110231 its reverse (13201113213212), we get a palindrome (34432344323443).

The spelling of 21231231110231 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred thirty-one million, one hundred ten thousand, two hundred thirty-one".