21934772 has 6 divisors (see below), whose sum is σ = 38385858. Its totient is φ = 10967384.

The previous prime is 21934753. The next prime is 21934789. The reversal of 21934772 is 27743912.

It can be written as a sum of positive squares in only one way, i.e., 21771556 + 163216 = 4666^2 + 404^2 .

It is a super-2 number, since 2×21934772² = 962268445383968, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 2741843 + ... + 2741850.

It is an arithmetic number, because the mean of its divisors is an integer number (6397643).

Almost surely, 2^21934772 is an apocalyptic number.

It is an amenable number.

21934772 is a deficient number, since it is larger than the sum of its proper divisors (16451086).

21934772 is a wasteful number, since it uses less digits than its factorization.

21934772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483697 (or 5483695 counting only the distinct ones).

The product of its digits is 21168, while the sum is 35.

The square root of 21934772 is about 4683.4572700090. The cubic root of 21934772 is about 279.9267325305.

The spelling of 21934772 in words is "twenty-one million, nine hundred thirty-four thousand, seven hundred seventy-two".