21861934 has 8 divisors (see below), whose sum is σ = 32865120. Its totient is φ = 10906896.

The previous prime is 21861893. The next prime is 21861971. The reversal of 21861934 is 43916812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21861934.

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, 10879 + ... + 12730.

It is an arithmetic number, because the mean of its divisors is an integer number (4108140).

Almost surely, 2^21861934 is an apocalyptic number.

21861934 is a deficient number, since it is larger than the sum of its proper divisors (11003186).

21861934 is a wasteful number, since it uses less digits than its factorization.

21861934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24074.

The product of its digits is 10368, while the sum is 34.

The square root of 21861934 is about 4675.6747106701. The cubic root of 21861934 is about 279.6165414217.

The spelling of 21861934 in words is "twenty-one million, eight hundred sixty-one thousand, nine hundred thirty-four".