21203660080075 has 12 divisors (see below), whose sum is σ = 28682769272328. Its totient is φ = 15420843694400.

The previous prime is 21203660080037. The next prime is 21203660080091. The reversal of 21203660080075 is 57008006630212.

It is not a de Polignac number, because 21203660080075 - 2¹⁹ = 21203659555787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38552108962 + ... + 38552109511.

It is an arithmetic number, because the mean of its divisors is an integer number (2390230772694).

Almost surely, 2^{21203660080075} is an apocalyptic number.

21203660080075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21203660080075 is a deficient number, since it is larger than the sum of its proper divisors (7479109192253).

21203660080075 is a wasteful number, since it uses less digits than its factorization.

21203660080075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77104218494 (or 77104218489 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21203660080075 in words is "twenty-one trillion, two hundred three billion, six hundred sixty million, eighty thousand, seventy-five".