21722942 has 8 divisors (see below), whose sum is σ = 32950800. Its totient is φ = 10739344.

The previous prime is 21722933. The next prime is 21722963. The reversal of 21722942 is 24922712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60842 + ... + 61197.

It is an arithmetic number, because the mean of its divisors is an integer number (4118850).

Almost surely, 2^21722942 is an apocalyptic number.

21722942 is a deficient number, since it is larger than the sum of its proper divisors (11227858).

21722942 is a wasteful number, since it uses less digits than its factorization.

21722942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122130.

The product of its digits is 4032, while the sum is 29.

The square root of 21722942 is about 4660.7877016659. The cubic root of 21722942 is about 279.0227068359.

The spelling of 21722942 in words is "twenty-one million, seven hundred twenty-two thousand, nine hundred forty-two".