21625198250 has 16 divisors (see below), whose sum is σ = 40482371592. Its totient is φ = 8650079200.

The previous prime is 21625198249. The next prime is 21625198307. The reversal of 21625198250 is 5289152612.

It can be written as a sum of positive squares in 4 ways, for example, as 1835179921 + 19790018329 = 42839^2 + 140677^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21625198198 and 21625198207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43250147 + ... + 43250646.

Almost surely, 2^21625198250 is an apocalyptic number.

21625198250 is a deficient number, since it is larger than the sum of its proper divisors (18857173342).

21625198250 is an equidigital number, since it uses as much as digits as its factorization.

21625198250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86500810 (or 86500800 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 21625198250 in words is "twenty-one billion, six hundred twenty-five million, one hundred ninety-eight thousand, two hundred fifty".