21002412343231 has 16 divisors (see below), whose sum is σ = 23471003556000. Its totient is φ = 18627052825600.

The previous prime is 21002412343229. The next prime is 21002412343243. The reversal of 21002412343231 is 13234321420012.

It is not a de Polignac number, because 21002412343231 - 2¹ = 21002412343229 is a prime.

It is a super-2 number, since 2×21002412343231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21002412343231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002412343261) 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, 24128865 + ... + 24984133.

It is an arithmetic number, because the mean of its divisors is an integer number (1466937722250).

Almost surely, 2^{21002412343231} is an apocalyptic number.

21002412343231 is a deficient number, since it is larger than the sum of its proper divisors (2468591212769).

21002412343231 is a wasteful number, since it uses less digits than its factorization.

21002412343231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909770.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21002412343231 its reverse (13234321420012), we get a palindrome (34236733763243).

The spelling of 21002412343231 in words is "twenty-one trillion, two billion, four hundred twelve million, three hundred forty-three thousand, two hundred thirty-one".