21224542325 has 36 divisors (see below), whose sum is σ = 32226687360. Its totient is φ = 13787958240.

The previous prime is 21224542321. The next prime is 21224542331. The reversal of 21224542325 is 52324542212.

It is not a de Polignac number, because 21224542325 - 2² = 21224542321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21224542291 and 21224542300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224542321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 432677 + ... + 479226.

It is an arithmetic number, because the mean of its divisors is an integer number (895185760).

Almost surely, 2^21224542325 is an apocalyptic number.

21224542325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21224542325 is a deficient number, since it is larger than the sum of its proper divisors (11002145035).

21224542325 is a wasteful number, since it uses less digits than its factorization.

21224542325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911946 (or 911934 counting only the distinct ones).

The product of its digits is 38400, while the sum is 32.

The spelling of 21224542325 in words is "twenty-one billion, two hundred twenty-four million, five hundred forty-two thousand, three hundred twenty-five".