21934204 has 12 divisors (see below), whose sum is σ = 38725344. Its totient is φ = 10869824.

The previous prime is 21934201. The next prime is 21934207. The reversal of 21934204 is 40243912.

It is an interprime number because it is at equal distance from previous prime (21934201) and next prime (21934207).

It is a super-2 number, since 2×21934204² = 962218610227232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934201) by changing a digit.

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, 23812 + ... + 24715.

It is an arithmetic number, because the mean of its divisors is an integer number (3227112).

Almost surely, 2^21934204 is an apocalyptic number.

It is an amenable number.

21934204 is a deficient number, since it is larger than the sum of its proper divisors (16791140).

21934204 is a wasteful number, since it uses less digits than its factorization.

21934204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48644 (or 48642 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21934204 is about 4683.3966306517. The cubic root of 21934204 is about 279.9243162793.

It can be divided in two parts, 21934 and 204, that multiplied together give a triangular number (4474536 = T₂₉₉₁).

The spelling of 21934204 in words is "twenty-one million, nine hundred thirty-four thousand, two hundred four".