21351225325 has 48 divisors (see below), whose sum is σ = 27560736000. Its totient is φ = 16399319040.

The previous prime is 21351225317. The next prime is 21351225331. The reversal of 21351225325 is 52352215312.

It is not a de Polignac number, because 21351225325 - 2³ = 21351225317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11301981 + ... + 11303869.

It is an arithmetic number, because the mean of its divisors is an integer number (574182000).

Almost surely, 2^21351225325 is an apocalyptic number.

21351225325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21351225325 is a deficient number, since it is larger than the sum of its proper divisors (6209510675).

21351225325 is a wasteful number, since it uses less digits than its factorization.

21351225325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134 (or 2129 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The spelling of 21351225325 in words is "twenty-one billion, three hundred fifty-one million, two hundred twenty-five thousand, three hundred twenty-five".