21822015225 has 24 divisors (see below), whose sum is σ = 37242909952. Its totient is φ = 11262974400.

The previous prime is 21822015211. The next prime is 21822015251. The reversal of 21822015225 is 52251022812.

It is not a de Polignac number, because 21822015225 - 2⁶ = 21822015161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21822015192 and 21822015201.

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 23 ways as a sum of consecutive naturals, for example, 4690582 + ... + 4695231.

Almost surely, 2^21822015225 is an apocalyptic number.

21822015225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21822015225 is a deficient number, since it is larger than the sum of its proper divisors (15420894727).

21822015225 is a wasteful number, since it uses less digits than its factorization.

21822015225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9385857 (or 9385852 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The spelling of 21822015225 in words is "twenty-one billion, eight hundred twenty-two million, fifteen thousand, two hundred twenty-five".