21425552 has 10 divisors (see below), whose sum is σ = 41512038. Its totient is φ = 10712768.

The previous prime is 21425549. The next prime is 21425587. The reversal of 21425552 is 25552412.

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 4648336 = 4096^2 + 2156^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669533 + ... + 669564.

Almost surely, 2^21425552 is an apocalyptic number.

It is an amenable number.

21425552 is a deficient number, since it is larger than the sum of its proper divisors (20086486).

21425552 is a wasteful number, since it uses less digits than its factorization.

21425552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339105 (or 1339099 counting only the distinct ones).

The product of its digits is 4000, while the sum is 26.

The square root of 21425552 is about 4628.7743518128. The cubic root of 21425552 is about 277.7435656117.

Adding to 21425552 its reverse (25552412), we get a palindrome (46977964).

The spelling of 21425552 in words is "twenty-one million, four hundred twenty-five thousand, five hundred fifty-two".