21320604534 has 8 divisors (see below), whose sum is σ = 42641209080. Its totient is φ = 7106868176.

The previous prime is 21320604523. The next prime is 21320604551. The reversal of 21320604534 is 43540602312.

It is a sphenic number, since it is the product of 3 distinct primes.

21320604534 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1776717039 + ... + 1776717050.

It is an arithmetic number, because the mean of its divisors is an integer number (5330151135).

Almost surely, 2^21320604534 is an apocalyptic number.

21320604534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21320604534 is a wasteful number, since it uses less digits than its factorization.

21320604534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553434094.

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 21320604534 in words is "twenty-one billion, three hundred twenty million, six hundred four thousand, five hundred thirty-four".