21604542330 has 32 divisors (see below), whose sum is σ = 59258173824. Its totient is φ = 4938181056.

The previous prime is 21604542307. The next prime is 21604542373. The reversal of 21604542330 is 3324540612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51439177 + ... + 51439596.

It is an arithmetic number, because the mean of its divisors is an integer number (1851817932).

Almost surely, 2^21604542330 is an apocalyptic number.

21604542330 is an abundant number, since it is smaller than the sum of its proper divisors (37653631494).

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

21604542330 is a wasteful number, since it uses less digits than its factorization.

21604542330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102878790.

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

The spelling of 21604542330 in words is "twenty-one billion, six hundred four million, five hundred forty-two thousand, three hundred thirty".