22079721 has 4 divisors (see below), whose sum is σ = 29439632. Its totient is φ = 14719812.

The previous prime is 22079669. The next prime is 22079723. The reversal of 22079721 is 12797022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22079721 - 2⁷ = 22079593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22079723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3679951 + ... + 3679956.

It is an arithmetic number, because the mean of its divisors is an integer number (7359908).

Almost surely, 2^22079721 is an apocalyptic number.

It is an amenable number.

22079721 is a deficient number, since it is larger than the sum of its proper divisors (7359911).

22079721 is an equidigital number, since it uses as much as digits as its factorization.

22079721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7359910.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 22079721 is about 4698.9063621230. The cubic root of 22079721 is about 280.5419816994.

The spelling of 22079721 in words is "twenty-two million, seventy-nine thousand, seven hundred twenty-one".