21934684 has 6 divisors (see below), whose sum is σ = 38385704. Its totient is φ = 10967340.

The previous prime is 21934681. The next prime is 21934691. The reversal of 21934684 is 48643912.

It is a super-2 number, since 2×21934684² = 962260724359712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934681) 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 as a sum of consecutive naturals, namely, 2741832 + ... + 2741839.

Almost surely, 2^21934684 is an apocalyptic number.

It is an amenable number.

21934684 is a deficient number, since it is larger than the sum of its proper divisors (16451020).

21934684 is a wasteful number, since it uses less digits than its factorization.

21934684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483675 (or 5483673 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 21934684 is about 4683.4478752304. The cubic root of 21934684 is about 279.9263581844.

The spelling of 21934684 in words is "twenty-one million, nine hundred thirty-four thousand, six hundred eighty-four".