21425292 has 36 divisors (see below), whose sum is σ = 61896016. Its totient is φ = 6121440.

The previous prime is 21425291. The next prime is 21425297. The reversal of 21425292 is 29252412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21425291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42259 + ... + 42762.

Almost surely, 2^21425292 is an apocalyptic number.

It is an amenable number.

21425292 is an abundant number, since it is smaller than the sum of its proper divisors (40470724).

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

21425292 is a wasteful number, since it uses less digits than its factorization.

21425292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85038 (or 85033 counting only the distinct ones).

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

The square root of 21425292 is about 4628.7462665391. The cubic root of 21425292 is about 277.7424421304.

Subtracting from 21425292 its product of digits (2880), we obtain a palindrome (21422412).

The spelling of 21425292 in words is "twenty-one million, four hundred twenty-five thousand, two hundred ninety-two".