21604550530264 has 64 divisors (see below), whose sum is σ = 46121130972000. Its totient is φ = 9405272724480.

The previous prime is 21604550530253. The next prime is 21604550530271. The reversal of 21604550530264 is 46203505540612.

It is a super-2 number, since 2×21604550530264² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21604550530264.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23419717 + ... + 24324724.

Almost surely, 2^{21604550530264} is an apocalyptic number.

It is an amenable number.

21604550530264 is an abundant number, since it is smaller than the sum of its proper divisors (24516580441736).

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

21604550530264 is a wasteful number, since it uses less digits than its factorization.

21604550530264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47744708 (or 47744704 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 21604550530264 in words is "twenty-one trillion, six hundred four billion, five hundred fifty million, five hundred thirty thousand, two hundred sixty-four".