21023400024 has 48 divisors (see below), whose sum is σ = 62114593320. Its totient is φ = 6370727040.

The previous prime is 21023400017. The next prime is 21023400049. The reversal of 21023400024 is 42000432012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13271557 + ... + 13273140.

Almost surely, 2^21023400024 is an apocalyptic number.

21023400024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21023400024 is an abundant number, since it is smaller than the sum of its proper divisors (41091193296).

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

21023400024 is a wasteful number, since it uses less digits than its factorization.

21023400024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26544720 (or 26544713 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21023400024 its reverse (42000432012), we get a palindrome (63023832036).

The spelling of 21023400024 in words is "twenty-one billion, twenty-three million, four hundred thousand, twenty-four".