21073618225 has 12 divisors (see below), whose sum is σ = 28506858480. Its totient is φ = 15326267600.

The previous prime is 21073618207. The next prime is 21073618231. The reversal of 21073618225 is 52281637012.

It is not a de Polignac number, because 21073618225 - 2⁵ = 21073618193 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, 38315395 + ... + 38315944.

It is an arithmetic number, because the mean of its divisors is an integer number (2375571540).

Almost surely, 2^21073618225 is an apocalyptic number.

21073618225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21073618225 is a deficient number, since it is larger than the sum of its proper divisors (7433240255).

21073618225 is a wasteful number, since it uses less digits than its factorization.

21073618225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76631360 (or 76631355 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 21073618225 in words is "twenty-one billion, seventy-three million, six hundred eighteen thousand, two hundred twenty-five".