21958722 has 32 divisors (see below), whose sum is σ = 49138560. Its totient is φ = 7268400.

The previous prime is 21958709. The next prime is 21958733. The reversal of 21958722 is 22785912.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6808 + ... + 9500.

It is an arithmetic number, because the mean of its divisors is an integer number (1535580).

Almost surely, 2^21958722 is an apocalyptic number.

21958722 is an abundant number, since it is smaller than the sum of its proper divisors (27179838).

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

21958722 is a wasteful number, since it uses less digits than its factorization.

21958722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855 (or 2849 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 21958722 is about 4686.0134442829. The cubic root of 21958722 is about 280.0285770153.

The spelling of 21958722 in words is "twenty-one million, nine hundred fifty-eight thousand, seven hundred twenty-two".