21337670 has 16 divisors (see below), whose sum is σ = 38465280. Its totient is φ = 8522304.

The previous prime is 21337643. The next prime is 21337717. The reversal of 21337670 is 7673312.

It is a super-2 number, since 2×21337670² = 910592322057800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 8411 + ... + 10649.

It is an arithmetic number, because the mean of its divisors is an integer number (2404080).

Almost surely, 2^21337670 is an apocalyptic number.

21337670 is a deficient number, since it is larger than the sum of its proper divisors (17127610).

21337670 is a wasteful number, since it uses less digits than its factorization.

21337670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 21337670 is about 4619.2715875991. The cubic root of 21337670 is about 277.3633014465.

The spelling of 21337670 in words is "twenty-one million, three hundred thirty-seven thousand, six hundred seventy".