21150295225 has 12 divisors (see below), whose sum is σ = 27130724460. Its totient is φ = 16336779200.

The previous prime is 21150295217. The next prime is 21150295261. The reversal of 21150295225 is 52259205112.

It can be written as a sum of positive squares in 6 ways, for example, as 3170703481 + 17979591744 = 56309^2 + 134088^2 .

It is not a de Polignac number, because 21150295225 - 2³ = 21150295217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14585686 + ... + 14587135.

It is an arithmetic number, because the mean of its divisors is an integer number (2260893705).

Almost surely, 2^21150295225 is an apocalyptic number.

21150295225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21150295225 is a deficient number, since it is larger than the sum of its proper divisors (5980429235).

21150295225 is a wasteful number, since it uses less digits than its factorization.

21150295225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29172860 (or 29172855 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 21150295225 in words is "twenty-one billion, one hundred fifty million, two hundred ninety-five thousand, two hundred twenty-five".