21304152 has 48 divisors (see below), whose sum is σ = 57915000. Its totient is φ = 7074816.

The previous prime is 21304147. The next prime is 21304219. The reversal of 21304152 is 25140312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31999 + ... + 32657.

Almost surely, 2^21304152 is an apocalyptic number.

It is an amenable number.

21304152 is an abundant number, since it is smaller than the sum of its proper divisors (36610848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21304152 is a wasteful number, since it uses less digits than its factorization.

21304152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21304152 is about 4615.6421005100. The cubic root of 21304152 is about 277.2179944966.

Adding to 21304152 its reverse (25140312), we get a palindrome (46444464).

The spelling of 21304152 in words is "twenty-one million, three hundred four thousand, one hundred fifty-two".