21934790 has 8 divisors (see below), whose sum is σ = 39482640. Its totient is φ = 8773912.

The previous prime is 21934789. The next prime is 21934813. The reversal of 21934790 is 9743912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21934790² = 962270024688200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21934790.

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 in 3 ways as a sum of consecutive naturals, for example, 1096730 + ... + 1096749.

It is an arithmetic number, because the mean of its divisors is an integer number (4935330).

Almost surely, 2^21934790 is an apocalyptic number.

21934790 is a deficient number, since it is larger than the sum of its proper divisors (17547850).

21934790 is a wasteful number, since it uses less digits than its factorization.

21934790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193486.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 21934790 is about 4683.4591916659. The cubic root of 21934790 is about 279.9268091011.

The spelling of 21934790 in words is "twenty-one million, nine hundred thirty-four thousand, seven hundred ninety".