21922943 has 12 divisors (see below), whose sum is σ = 25580232. Its totient is φ = 18733680.

The previous prime is 21922939. The next prime is 21922949. The reversal of 21922943 is 34922912.

It is not a de Polignac number, because 21922943 - 2² = 21922939 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26096 + ... + 26922.

It is an arithmetic number, because the mean of its divisors is an integer number (2131686).

Almost surely, 2^21922943 is an apocalyptic number.

21922943 is a deficient number, since it is larger than the sum of its proper divisors (3657289).

21922943 is an equidigital number, since it uses as much as digits as its factorization.

21922943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382 (or 1375 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 21922943 is about 4682.1942505624. The cubic root of 21922943 is about 279.8764037841.

The spelling of 21922943 in words is "twenty-one million, nine hundred twenty-two thousand, nine hundred forty-three".