21162650642550 has 96 divisors (see below), whose sum is σ = 58320895795200. Its totient is φ = 5642789352480.

The previous prime is 21162650642527. The next prime is 21162650642603. The reversal of 21162650642550 is 5524605626112.

21162650642550 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 2 + 6 + 50 + 6 + 42 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21162650642496 and 21162650642505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12314187 + ... + 13927113.

It is an arithmetic number, because the mean of its divisors is an integer number (607509331200).

Almost surely, 2^{21162650642550} is an apocalyptic number.

21162650642550 is an abundant number, since it is smaller than the sum of its proper divisors (37158245152650).

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

21162650642550 is a wasteful number, since it uses less digits than its factorization.

21162650642550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622667 (or 1622656 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 21162650642550 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty million, six hundred forty-two thousand, five hundred fifty".