21553366335512 has 16 divisors (see below), whose sum is σ = 44086431141000. Its totient is φ = 9796984697920.

The previous prime is 21553366335443. The next prime is 21553366335541.

21553366335512 is nontrivially palindromic in base 10.

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, 122462308637 + ... + 122462308812.

Almost surely, 2^{21553366335512} is an apocalyptic number.

21553366335512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21553366335512 is an abundant number, since it is smaller than the sum of its proper divisors (22533064805488).

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

21553366335512 is a wasteful number, since it uses less digits than its factorization.

21553366335512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244924617466 (or 244924617462 counting only the distinct ones).

The product of its digits is 7290000, while the sum is 50.

The spelling of 21553366335512 in words is "twenty-one trillion, five hundred fifty-three billion, three hundred sixty-six million, three hundred thirty-five thousand, five hundred twelve".