21522152 has 32 divisors (see below), whose sum is σ = 41358600. Its totient is φ = 10497024.

The previous prime is 21522139. The next prime is 21522161. The reversal of 21522152 is 25122512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15100996 + 6421156 = 3886^2 + 2534^2 .

It is a super-2 number, since 2×21522152² = 926406053422208, which contains 22 as substring.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 79874 + ... + 80142.

Almost surely, 2^21522152 is an apocalyptic number.

It is an amenable number.

21522152 is a deficient number, since it is larger than the sum of its proper divisors (19836448).

21522152 is a wasteful number, since it uses less digits than its factorization.

21522152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 481 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 21522152 is about 4639.1973443690. The cubic root of 21522152 is about 278.1603546690.

Adding to 21522152 its reverse (25122512), we get a palindrome (46644664).

The spelling of 21522152 in words is "twenty-one million, five hundred twenty-two thousand, one hundred fifty-two".