21650849225 has 6 divisors (see below), whose sum is σ = 26847053070. Its totient is φ = 17320679360.

The previous prime is 21650849179. The next prime is 21650849263. The reversal of 21650849225 is 52294805612.

It can be written as a sum of positive squares in 3 ways, for example, as 1879395904 + 19771453321 = 43352^2 + 140611^2 .

It is not a de Polignac number, because 21650849225 - 2⁶ = 21650849161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433016960 + ... + 433017009.

It is an arithmetic number, because the mean of its divisors is an integer number (4474508845).

Almost surely, 2^21650849225 is an apocalyptic number.

21650849225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21650849225 is a deficient number, since it is larger than the sum of its proper divisors (5196203845).

21650849225 is an equidigital number, since it uses as much as digits as its factorization.

21650849225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866033979 (or 866033974 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 21650849225 in words is "twenty-one billion, six hundred fifty million, eight hundred forty-nine thousand, two hundred twenty-five".