21011310221231 has 12 divisors (see below), whose sum is σ = 23439779167896. Its totient is φ = 18816098698320.

The previous prime is 21011310221183. The next prime is 21011310221267. The reversal of 21011310221231 is 13212201311012.

It is not a de Polignac number, because 21011310221231 - 2¹⁴ = 21011310204847 is a prime.

It is a super-2 number, since 2×21011310221231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011310221131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1295866460 + ... + 1295882673.

It is an arithmetic number, because the mean of its divisors is an integer number (1953314930658).

Almost surely, 2^{21011310221231} is an apocalyptic number.

21011310221231 is a deficient number, since it is larger than the sum of its proper divisors (2428468946665).

21011310221231 is a wasteful number, since it uses less digits than its factorization.

21011310221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591749222 (or 2591749211 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21011310221231 its reverse (13212201311012), we get a palindrome (34223511532243).

The spelling of 21011310221231 in words is "twenty-one trillion, eleven billion, three hundred ten million, two hundred twenty-one thousand, two hundred thirty-one".