21604636410 has 64 divisors (see below), whose sum is σ = 59284058112. Its totient is φ = 4936067136.

The previous prime is 21604636409. The next prime is 21604636411. The reversal of 21604636410 is 1463640612.

It is an interprime number because it is at equal distance from previous prime (21604636409) and next prime (21604636411).

It is not an unprimeable number, because it can be changed into a prime (21604636411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 492849 + ... + 534891.

It is an arithmetic number, because the mean of its divisors is an integer number (926313408).

Almost surely, 2^21604636410 is an apocalyptic number.

21604636410 is an abundant number, since it is smaller than the sum of its proper divisors (37679421702).

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

21604636410 is a wasteful number, since it uses less digits than its factorization.

21604636410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44507.

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 21604636410 in words is "twenty-one billion, six hundred four million, six hundred thirty-six thousand, four hundred ten".