21917934 has 12 divisors (see below), whose sum is σ = 47488896. Its totient is φ = 7305972.

The previous prime is 21917927. The next prime is 21917977. The reversal of 21917934 is 43971912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 608814 + ... + 608849.

It is an arithmetic number, because the mean of its divisors is an integer number (3957408).

Almost surely, 2^21917934 is an apocalyptic number.

21917934 is an abundant number, since it is smaller than the sum of its proper divisors (25570962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21917934 is a wasteful number, since it uses less digits than its factorization.

21917934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217671 (or 1217668 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 21917934 is about 4681.6593212236. The cubic root of 21917934 is about 279.8550865779.

The spelling of 21917934 in words is "twenty-one million, nine hundred seventeen thousand, nine hundred thirty-four".