21204595040 has 48 divisors (see below), whose sum is σ = 53042677632. Its totient is φ = 7982905344.

The previous prime is 21204595037. The next prime is 21204595043. The reversal of 21204595040 is 4059540212.

It is an interprime number because it is at equal distance from previous prime (21204595037) and next prime (21204595043).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 21204594988 and 21204595006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204595043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3895184 + ... + 3900623.

It is an arithmetic number, because the mean of its divisors is an integer number (1105055784).

Almost surely, 2^21204595040 is an apocalyptic number.

21204595040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21204595040 is an abundant number, since it is smaller than the sum of its proper divisors (31838082592).

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

21204595040 is a wasteful number, since it uses less digits than its factorization.

21204595040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7795839 (or 7795831 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 21204595040 in words is "twenty-one billion, two hundred four million, five hundred ninety-five thousand, forty".