21425476 has 24 divisors (see below), whose sum is σ = 38201240. Its totient is φ = 10513152.

The previous prime is 21425471. The next prime is 21425477. The reversal of 21425476 is 67452412.

It can be written as a sum of positive squares in 4 ways, for example, as 25600 + 21399876 = 160^2 + 4626^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68296 + ... + 68608.

Almost surely, 2^21425476 is an apocalyptic number.

It is an amenable number.

21425476 is a deficient number, since it is larger than the sum of its proper divisors (16775764).

21425476 is a wasteful number, since it uses less digits than its factorization.

21425476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 581 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 21425476 is about 4628.7661422889. The cubic root of 21425476 is about 277.7432372104.

Adding to 21425476 its reverse (67452412), we get a palindrome (88877888).

The spelling of 21425476 in words is "twenty-one million, four hundred twenty-five thousand, four hundred seventy-six".