21204102024 has 96 divisors (see below), whose sum is σ = 68516690400. Its totient is φ = 6058311840.

The previous prime is 21204102019. The next prime is 21204102037. The reversal of 21204102024 is 42020140212.

21204102024 is a `hidden beast` number, since 212 + 0 + 410 + 20 + 24 = 666.

It is a super-2 number, since 2×21204102024² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 21204101988 and 21204102006.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 991122 + ... + 1012289.

It is an arithmetic number, because the mean of its divisors is an integer number (713715525).

Almost surely, 2^21204102024 is an apocalyptic number.

21204102024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21204102024 is an abundant number, since it is smaller than the sum of its proper divisors (47312588376).

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

21204102024 is a wasteful number, since it uses less digits than its factorization.

21204102024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003440 (or 2003423 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21204102024 its reverse (42020140212), we get a palindrome (63224242236).

The spelling of 21204102024 in words is "twenty-one billion, two hundred four million, one hundred two thousand, twenty-four".