21772425 has 24 divisors (see below), whose sum is σ = 36594880. Its totient is φ = 11419200.

The previous prime is 21772381. The next prime is 21772433. The reversal of 21772425 is 52427712.

It is not a de Polignac number, because 21772425 - 2⁹ = 21771913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21772392 and 21772401.

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, 2196 + ... + 6954.

Almost surely, 2^21772425 is an apocalyptic number.

21772425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21772425 is a deficient number, since it is larger than the sum of its proper divisors (14822455).

21772425 is a wasteful number, since it uses less digits than its factorization.

21772425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4833 (or 4828 counting only the distinct ones).

The product of its digits is 7840, while the sum is 30.

The square root of 21772425 is about 4666.0931195166. The cubic root of 21772425 is about 279.2344094407.

The spelling of 21772425 in words is "twenty-one million, seven hundred seventy-two thousand, four hundred twenty-five".