21365100273250 has 96 divisors (see below), whose sum is σ = 42598562189040. Its totient is φ = 8021967321600.

The previous prime is 21365100273211. The next prime is 21365100273281. The reversal of 21365100273250 is 5237200156312.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6006562787241 + 15358537486009 = 2450829^2 + 3918997^2 .

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, 8751322 + ... + 10923178.

Almost surely, 2^{21365100273250} is an apocalyptic number.

21365100273250 is a deficient number, since it is larger than the sum of its proper divisors (21233461915790).

21365100273250 is a wasteful number, since it uses less digits than its factorization.

21365100273250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172021 (or 2171992 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 21365100273250 in words is "twenty-one trillion, three hundred sixty-five billion, one hundred million, two hundred seventy-three thousand, two hundred fifty".