21112425 has 36 divisors (see below), whose sum is σ = 38223744. Its totient is φ = 11138400.

The previous prime is 21112411. The next prime is 21112433. The reversal of 21112425 is 52421112.

It is not a de Polignac number, because 21112425 - 2⁶ = 21112361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112398 and 21112407.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22720 + ... + 23630.

Almost surely, 2^21112425 is an apocalyptic number.

21112425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21112425 is a deficient number, since it is larger than the sum of its proper divisors (17111319).

21112425 is a wasteful number, since it uses less digits than its factorization.

21112425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030 (or 1022 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21112425 is about 4594.8258944165. The cubic root of 21112425 is about 276.3838782437.

Adding to 21112425 its reverse (52421112), we get a palindrome (73533537).

The spelling of 21112425 in words is "twenty-one million, one hundred twelve thousand, four hundred twenty-five".