21023102304 has 36 divisors (see below), whose sum is σ = 59784447996. Its totient is φ = 7007700672.

The previous prime is 21023102297. The next prime is 21023102329. The reversal of 21023102304 is 40320132012.

It is a tau number, because it is divible by the number of its divisors (36).

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 5 ways as a sum of consecutive naturals, for example, 36498154 + ... + 36498729.

It is an arithmetic number, because the mean of its divisors is an integer number (1660679111).

Almost surely, 2^21023102304 is an apocalyptic number.

21023102304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21023102304 is an abundant number, since it is smaller than the sum of its proper divisors (38761345692).

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

21023102304 is a wasteful number, since it uses less digits than its factorization.

21023102304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72996899 (or 72996888 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21023102304 its reverse (40320132012), we get a palindrome (61343234316).

The spelling of 21023102304 in words is "twenty-one billion, twenty-three million, one hundred two thousand, three hundred four".