21232522 has 4 divisors (see below), whose sum is σ = 31848786. Its totient is φ = 10616260.

The previous prime is 21232513. The next prime is 21232531. The reversal of 21232522 is 22523212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21232513) and next prime (21232531).

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 2405601 = 4339^2 + 1551^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21232522.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308129 + ... + 5308132.

Almost surely, 2^21232522 is an apocalyptic number.

21232522 is a deficient number, since it is larger than the sum of its proper divisors (10616264).

21232522 is a wasteful number, since it uses less digits than its factorization.

21232522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10616263.

The product of its digits is 480, while the sum is 19.

The square root of 21232522 is about 4607.8760834033. The cubic root of 21232522 is about 276.9069530696.

Adding to 21232522 its reverse (22523212), we get a palindrome (43755734).

The spelling of 21232522 in words is "twenty-one million, two hundred thirty-two thousand, five hundred twenty-two".