21136324425 has 12 divisors (see below), whose sum is σ = 34945389840. Its totient is φ = 11272706320.

The previous prime is 21136324403. The next prime is 21136324453. The reversal of 21136324425 is 52442363112.

It is not a de Polignac number, because 21136324425 - 2¹⁴ = 21136308041 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, 140908755 + ... + 140908904.

It is an arithmetic number, because the mean of its divisors is an integer number (2912115820).

Almost surely, 2^21136324425 is an apocalyptic number.

21136324425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21136324425 is a deficient number, since it is larger than the sum of its proper divisors (13809065415).

21136324425 is a wasteful number, since it uses less digits than its factorization.

21136324425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281817672 (or 281817667 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

Adding to 21136324425 its reverse (52442363112), we get a palindrome (73578687537).

The spelling of 21136324425 in words is "twenty-one billion, one hundred thirty-six million, three hundred twenty-four thousand, four hundred twenty-five".