21955934 has 48 divisors (see below), whose sum is σ = 44598624. Its totient is φ = 7888320.

The previous prime is 21955933. The next prime is 21955943. The reversal of 21955934 is 43955912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21955931) 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 23 ways as a sum of consecutive naturals, for example, 21524 + ... + 22520.

It is an arithmetic number, because the mean of its divisors is an integer number (929138).

Almost surely, 2^21955934 is an apocalyptic number.

21955934 is an abundant number, since it is smaller than the sum of its proper divisors (22642690).

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

21955934 is a wasteful number, since it uses less digits than its factorization.

21955934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1030 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The square root of 21955934 is about 4685.7159538325. The cubic root of 21955934 is about 280.0167251914.

The spelling of 21955934 in words is "twenty-one million, nine hundred fifty-five thousand, nine hundred thirty-four".