21846825225 has 24 divisors (see below), whose sum is σ = 40133428320. Its totient is φ = 11651639760.

The previous prime is 21846825211. The next prime is 21846825227. The reversal of 21846825225 is 52252864812.

21846825225 is a `hidden beast` number, since 2 + 1 + 8 + 46 + 82 + 522 + 5 = 666.

It is not a de Polignac number, because 21846825225 - 2⁵ = 21846825193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21846825227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16182159 + ... + 16183508.

It is an arithmetic number, because the mean of its divisors is an integer number (1672226180).

Almost surely, 2^21846825225 is an apocalyptic number.

21846825225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21846825225 is a deficient number, since it is larger than the sum of its proper divisors (18286603095).

21846825225 is a wasteful number, since it uses less digits than its factorization.

21846825225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32365686 (or 32365675 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The spelling of 21846825225 in words is "twenty-one billion, eight hundred forty-six million, eight hundred twenty-five thousand, two hundred twenty-five".