21604550536472 has 24 divisors (see below), whose sum is σ = 41632947343260. Its totient is φ = 10510321877280.

The previous prime is 21604550536441. The next prime is 21604550536489. The reversal of 21604550536472 is 27463505540612.

It is a self number, because there is not a number n which added to its sum of digits gives 21604550536472.

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 5 ways as a sum of consecutive naturals, for example, 986318054 + ... + 986339957.

Almost surely, 2^{21604550536472} is an apocalyptic number.

It is an amenable number.

21604550536472 is a deficient number, since it is larger than the sum of its proper divisors (20028396806788).

21604550536472 is a wasteful number, since it uses less digits than its factorization.

21604550536472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972658091 (or 1972658050 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 50.

The spelling of 21604550536472 in words is "twenty-one trillion, six hundred four billion, five hundred fifty million, five hundred thirty-six thousand, four hundred seventy-two".