21231402024 has 32 divisors (see below), whose sum is σ = 60661149120. Its totient is φ = 6066114816.

The previous prime is 21231402007. The next prime is 21231402037. The reversal of 21231402024 is 42020413212.

It is a super-2 number, since 2×21231402024² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63188529 + ... + 63188864.

It is an arithmetic number, because the mean of its divisors is an integer number (1895660910).

Almost surely, 2^21231402024 is an apocalyptic number.

21231402024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21231402024 is an abundant number, since it is smaller than the sum of its proper divisors (39429747096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231402024 is a wasteful number, since it uses less digits than its factorization.

21231402024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126377409 (or 126377405 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21231402024 its reverse (42020413212), we get a palindrome (63251815236).

The spelling of 21231402024 in words is "twenty-one billion, two hundred thirty-one million, four hundred two thousand, twenty-four".