21086250272 has 24 divisors (see below), whose sum is σ = 42635545596. Its totient is φ = 10258175232.

The previous prime is 21086250257. The next prime is 21086250301. The reversal of 21086250272 is 27205268012.

It can be written as a sum of positive squares in 2 ways, for example, as 14717571856 + 6368678416 = 121316^2 + 79804^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8903483 + ... + 8905850.

Almost surely, 2^21086250272 is an apocalyptic number.

It is an amenable number.

21086250272 is an abundant number, since it is smaller than the sum of its proper divisors (21549295324).

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

21086250272 is a wasteful number, since it uses less digits than its factorization.

21086250272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17809380 (or 17809372 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 21086250272 in words is "twenty-one billion, eighty-six million, two hundred fifty thousand, two hundred seventy-two".