21523040304 has 40 divisors (see below), whose sum is σ = 57103926960. Its totient is φ = 6980444928.

The previous prime is 21523040299. The next prime is 21523040311. The reversal of 21523040304 is 40304032512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6057639 + ... + 6061190.

It is an arithmetic number, because the mean of its divisors is an integer number (1427598174).

Almost surely, 2^21523040304 is an apocalyptic number.

21523040304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21523040304 is an abundant number, since it is smaller than the sum of its proper divisors (35580886656).

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

21523040304 is a wasteful number, since it uses less digits than its factorization.

21523040304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12118877 (or 12118871 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21523040304 its reverse (40304032512), we get a palindrome (61827072816).

It can be divided in two parts, 21 and 523040304, that added together give a palindrome (523040325).

The spelling of 21523040304 in words is "twenty-one billion, five hundred twenty-three million, forty thousand, three hundred four".