22432721 has 4 divisors (see below), whose sum is σ = 22481844. Its totient is φ = 22383600.

The previous prime is 22432703. The next prime is 22432733. The reversal of 22432721 is 12723422.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12723422 = 2 ⋅6361711.

It can be written as a sum of positive squares in 2 ways, for example, as 6948496 + 15484225 = 2636^2 + 3935^2 .

It is a cyclic number.

It is not a de Polignac number, because 22432721 - 2²² = 18238417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22432021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23870 + ... + 24791.

It is an arithmetic number, because the mean of its divisors is an integer number (5620461).

Almost surely, 2^22432721 is an apocalyptic number.

It is an amenable number.

22432721 is a deficient number, since it is larger than the sum of its proper divisors (49123).

22432721 is an equidigital number, since it uses as much as digits as its factorization.

22432721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49122.

The product of its digits is 1344, while the sum is 23.

The square root of 22432721 is about 4736.3193515640. The cubic root of 22432721 is about 282.0291412301.

The spelling of 22432721 in words is "twenty-two million, four hundred thirty-two thousand, seven hundred twenty-one".