21104460040 has 32 divisors (see below), whose sum is σ = 47654046360. Its totient is φ = 8411737600.

The previous prime is 21104460017. The next prime is 21104460043. The reversal of 21104460040 is 4006440112.

It can be written as a sum of positive squares in 4 ways, for example, as 17181442084 + 3923017956 = 131078^2 + 62634^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21104459993 and 21104460020.

It is not an unprimeable number, because it can be changed into a prime (21104460043) 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, 927571 + ... + 950050.

Almost surely, 2^21104460040 is an apocalyptic number.

21104460040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21104460040 is an abundant number, since it is smaller than the sum of its proper divisors (26549586320).

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

21104460040 is a wasteful number, since it uses less digits than its factorization.

21104460040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877913 (or 1877909 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The spelling of 21104460040 in words is "twenty-one billion, one hundred four million, four hundred sixty thousand, forty".