21112552 has 8 divisors (see below), whose sum is σ = 39586050. Its totient is φ = 10556272.

The previous prime is 21112547. The next prime is 21112561. The reversal of 21112552 is 25521112.

It can be written as a sum of positive squares in only one way, i.e., 20848356 + 264196 = 4566^2 + 514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319527 + ... + 1319542.

Almost surely, 2^21112552 is an apocalyptic number.

It is an amenable number.

21112552 is a deficient number, since it is larger than the sum of its proper divisors (18473498).

21112552 is a wasteful number, since it uses less digits than its factorization.

21112552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639075 (or 2639071 counting only the distinct ones).

The product of its digits is 200, while the sum is 19.

The square root of 21112552 is about 4594.8397142882. The cubic root of 21112552 is about 276.3844324305.

Adding to 21112552 its reverse (25521112), we get a palindrome (46633664).

The spelling of 21112552 in words is "twenty-one million, one hundred twelve thousand, five hundred fifty-two".