21590396 has 6 divisors (see below), whose sum is σ = 37783200. Its totient is φ = 10795196.

The previous prime is 21590369. The next prime is 21590411. The reversal of 21590396 is 69309512.

It is a super-2 number, since 2×21590396² = 932290398873632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2698796 + ... + 2698803.

It is an arithmetic number, because the mean of its divisors is an integer number (6297200).

Almost surely, 2^21590396 is an apocalyptic number.

It is an amenable number.

21590396 is a deficient number, since it is larger than the sum of its proper divisors (16192804).

21590396 is a wasteful number, since it uses less digits than its factorization.

21590396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397603 (or 5397601 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21590396 is about 4646.5466746822. The cubic root of 21590396 is about 278.4540481393.

The spelling of 21590396 in words is "twenty-one million, five hundred ninety thousand, three hundred ninety-six".