21692520250 has 16 divisors (see below), whose sum is σ = 40608398376. Its totient is φ = 8677008000.

The previous prime is 21692520233. The next prime is 21692520257. The reversal of 21692520250 is 5202529612.

It can be written as a sum of positive squares in 4 ways, for example, as 1208327121 + 20484193129 = 34761^2 + 143123^2 .

It is not an unprimeable number, because it can be changed into a prime (21692520257) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43384791 + ... + 43385290.

Almost surely, 2^21692520250 is an apocalyptic number.

21692520250 is a deficient number, since it is larger than the sum of its proper divisors (18915878126).

21692520250 is an equidigital number, since it uses as much as digits as its factorization.

21692520250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86770098 (or 86770088 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 21692520250 in words is "twenty-one billion, six hundred ninety-two million, five hundred twenty thousand, two hundred fifty".