21525052 has 6 divisors (see below), whose sum is σ = 37668848. Its totient is φ = 10762524.

The previous prime is 21525017. The next prime is 21525059. The reversal of 21525052 is 25052512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2690628 + ... + 2690635.

Almost surely, 2^21525052 is an apocalyptic number.

It is an amenable number.

21525052 is a deficient number, since it is larger than the sum of its proper divisors (16143796).

21525052 is a wasteful number, since it uses less digits than its factorization.

21525052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381267 (or 5381265 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 21525052 is about 4639.5098879084. The cubic root of 21525052 is about 278.1728476700.

Adding to 21525052 its reverse (25052512), we get a palindrome (46577564).

The spelling of 21525052 in words is "twenty-one million, five hundred twenty-five thousand, fifty-two".