21232052 has 12 divisors (see below), whose sum is σ = 37393860. Its totient is φ = 10548096.

The previous prime is 21232049. The next prime is 21232073. The reversal of 21232052 is 25023212.

It can be written as a sum of positive squares in 2 ways, for example, as 9024016 + 12208036 = 3004^2 + 3494^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21232052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16277 + ... + 17532.

It is an arithmetic number, because the mean of its divisors is an integer number (3116155).

Almost surely, 2^21232052 is an apocalyptic number.

It is an amenable number.

21232052 is a deficient number, since it is larger than the sum of its proper divisors (16161808).

21232052 is a wasteful number, since it uses less digits than its factorization.

21232052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33970 (or 33968 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21232052 is about 4607.8250834857. The cubic root of 21232052 is about 276.9049098639.

Adding to 21232052 its reverse (25023212), we get a palindrome (46255264).

The spelling of 21232052 in words is "twenty-one million, two hundred thirty-two thousand, fifty-two".