22121725 has 24 divisors (see below), whose sum is σ = 28533888. Its totient is φ = 17001600.

The previous prime is 22121717. The next prime is 22121761. The reversal of 22121725 is 52712122.

It is not a de Polignac number, because 22121725 - 2³ = 22121717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121696 and 22121705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78585 + ... + 78865.

It is an arithmetic number, because the mean of its divisors is an integer number (1188912).

Almost surely, 2^22121725 is an apocalyptic number.

22121725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22121725 is a deficient number, since it is larger than the sum of its proper divisors (6412163).

22121725 is a wasteful number, since it uses less digits than its factorization.

22121725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 400 counting only the distinct ones).

The product of its digits is 560, while the sum is 22.

The square root of 22121725 is about 4703.3737891008. The cubic root of 22121725 is about 280.7197680765.

Adding to 22121725 its reverse (52712122), we get a palindrome (74833847).

The spelling of 22121725 in words is "twenty-two million, one hundred twenty-one thousand, seven hundred twenty-five".