22076721 has 12 divisors (see below), whose sum is σ = 31936372. Its totient is φ = 14695776.

The previous prime is 22076713. The next prime is 22076723. The reversal of 22076721 is 12767022.

It can be written as a sum of positive squares in 2 ways, for example, as 17514225 + 4562496 = 4185^2 + 2136^2 .

It is not a de Polignac number, because 22076721 - 2³ = 22076713 is a prime.

It is a super-2 number, since 2×22076721² = 974763220223682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22076723) 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, 6495 + ... + 9291.

Almost surely, 2^22076721 is an apocalyptic number.

It is an amenable number.

22076721 is a deficient number, since it is larger than the sum of its proper divisors (9859651).

22076721 is a wasteful number, since it uses less digits than its factorization.

22076721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680 (or 3677 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 22076721 is about 4698.5871280631. The cubic root of 22076721 is about 280.5292752577.

The spelling of 22076721 in words is "twenty-two million, seventy-six thousand, seven hundred twenty-one".