22272721 has 4 divisors (see below), whose sum is σ = 22303600. Its totient is φ = 22241844.

The previous prime is 22272713. The next prime is 22272727. The reversal of 22272721 is 12727222.

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 a cyclic number.

It is not a de Polignac number, because 22272721 - 2³ = 22272713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22272727) 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, 14331 + ... + 15808.

It is an arithmetic number, because the mean of its divisors is an integer number (5575900).

Almost surely, 2^22272721 is an apocalyptic number.

It is an amenable number.

22272721 is a deficient number, since it is larger than the sum of its proper divisors (30879).

22272721 is an equidigital number, since it uses as much as digits as its factorization.

22272721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30878.

The product of its digits is 1568, while the sum is 25.

The square root of 22272721 is about 4719.3983726742. The cubic root of 22272721 is about 281.3570222498.

Adding to 22272721 its reverse (12727222), we get a palindrome (34999943).

The spelling of 22272721 in words is "twenty-two million, two hundred seventy-two thousand, seven hundred twenty-one".