21922425 has 72 divisors (see below), whose sum is σ = 46425600. Its totient is φ = 9676800.

The previous prime is 21922423. The next prime is 21922429. The reversal of 21922425 is 52422912.

It is a happy number.

21922425 is a `hidden beast` number, since 219 + 22 + 425 = 666.

It is not a de Polignac number, because 21922425 - 2¹ = 21922423 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922423) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 48601 + ... + 49049.

It is an arithmetic number, because the mean of its divisors is an integer number (644800).

Almost surely, 2^21922425 is an apocalyptic number.

21922425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21922425 is an abundant number, since it is smaller than the sum of its proper divisors (24503175).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21922425 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (21922424) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (503).

21922425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 495 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21922425 is about 4682.1389342906. The cubic root of 21922425 is about 279.8741994402.

The spelling of 21922425 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred twenty-five".