21624165426450 has 48 divisors (see below), whose sum is σ = 53662686457536. Its totient is φ = 5762706888000.

The previous prime is 21624165426449. The next prime is 21624165426481. The reversal of 21624165426450 is 5462456142612.

It is a self number, because there is not a number n which added to its sum of digits gives 21624165426450.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46483101 + ... + 46946000.

It is an arithmetic number, because the mean of its divisors is an integer number (1117972634532).

Almost surely, 2^{21624165426450} is an apocalyptic number.

21624165426450 is an abundant number, since it is smaller than the sum of its proper divisors (32038521031086).

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

21624165426450 is a wasteful number, since it uses less digits than its factorization.

21624165426450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93430659 (or 93430654 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 21624165426450 in words is "twenty-one trillion, six hundred twenty-four billion, one hundred sixty-five million, four hundred twenty-six thousand, four hundred fifty".