21755655712 has 48 divisors (see below), whose sum is σ = 48965031360. Its totient is φ = 9321032448.

The previous prime is 21755655707. The next prime is 21755655743.

21755655712 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837739 + ... + 863317.

It is an arithmetic number, because the mean of its divisors is an integer number (1020104820).

Almost surely, 2^21755655712 is an apocalyptic number.

It is an amenable number.

21755655712 is an abundant number, since it is smaller than the sum of its proper divisors (27209375648).

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

21755655712 is a wasteful number, since it uses less digits than its factorization.

21755655712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29393 (or 29385 counting only the distinct ones).

The product of its digits is 735000, while the sum is 46.

The spelling of 21755655712 in words is "twenty-one billion, seven hundred fifty-five million, six hundred fifty-five thousand, seven hundred twelve".