21123365300224 has 72 divisors (see below), whose sum is σ = 46425152518290. Its totient is φ = 9601529569280.

The previous prime is 21123365300203. The next prime is 21123365300269. The reversal of 21123365300224 is 42200356332112.

It can be written as a sum of positive squares in only one way, i.e., 17868949300224 + 3254416000000 = 4227168^2 + 1804000^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21123365300224.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42372619 + ... + 42868234.

Almost surely, 2^{21123365300224} is an apocalyptic number.

It is an amenable number.

21123365300224 is an abundant number, since it is smaller than the sum of its proper divisors (25301787218066).

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

21123365300224 is an equidigital number, since it uses as much as digits as its factorization.

21123365300224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85240897 (or 85240866 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 21123365300224 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred sixty-five million, three hundred thousand, two hundred twenty-four".