21425562 has 24 divisors (see below), whose sum is σ = 46527156. Its totient is φ = 7125696.

The previous prime is 21425549. The next prime is 21425587. The reversal of 21425562 is 26552412.

It can be written as a sum of positive squares in 2 ways, for example, as 15992001 + 5433561 = 3999^2 + 2331^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8958 + ... + 11094.

Almost surely, 2^21425562 is an apocalyptic number.

21425562 is an abundant number, since it is smaller than the sum of its proper divisors (25101594).

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

21425562 is a wasteful number, since it uses less digits than its factorization.

21425562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702 (or 2699 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 21425562 is about 4628.7754320122. The cubic root of 21425562 is about 277.7436088223.

Adding to 21425562 its reverse (26552412), we get a palindrome (47977974).

The spelling of 21425562 in words is "twenty-one million, four hundred twenty-five thousand, five hundred sixty-two".