21412402431 has 64 divisors (see below), whose sum is σ = 34975564800. Its totient is φ = 11381078016.

The previous prime is 21412402379. The next prime is 21412402433. The reversal of 21412402431 is 13420421412.

It is not a de Polignac number, because 21412402431 - 2⁹ = 21412401919 is a prime.

It is a super-2 number, since 2×21412402431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412402433) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4912305 + ... + 4916661.

It is an arithmetic number, because the mean of its divisors is an integer number (546493200).

Almost surely, 2^21412402431 is an apocalyptic number.

21412402431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21412402431 is a deficient number, since it is larger than the sum of its proper divisors (13563162369).

21412402431 is a wasteful number, since it uses less digits than its factorization.

21412402431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21412402431 its reverse (13420421412), we get a palindrome (34832823843).

The spelling of 21412402431 in words is "twenty-one billion, four hundred twelve million, four hundred two thousand, four hundred thirty-one".