22182721 has 8 divisors (see below), whose sum is σ = 24853824. Its totient is φ = 19620720.

The previous prime is 22182707. The next prime is 22182733. The reversal of 22182721 is 12728122.

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

It is a cyclic number.

It is not a de Polignac number, because 22182721 - 2⁵ = 22182689 is a prime.

It is a super-2 number, since 2×22182721² = 984146221927682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22182751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26845 + ... + 27658.

It is an arithmetic number, because the mean of its divisors is an integer number (3106728).

Almost surely, 2^22182721 is an apocalyptic number.

It is an amenable number.

22182721 is a deficient number, since it is larger than the sum of its proper divisors (2671103).

22182721 is a wasteful number, since it uses less digits than its factorization.

22182721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54551.

The product of its digits is 896, while the sum is 25.

The square root of 22182721 is about 4709.8536070668. The cubic root of 22182721 is about 280.9775398604.

The spelling of 22182721 in words is "twenty-two million, one hundred eighty-two thousand, seven hundred twenty-one".