22623721 has 2 divisors, whose sum is σ = 22623722. Its totient is φ = 22623720.

The previous prime is 22623701. The next prime is 22623749. The reversal of 22623721 is 12732622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13980121 + 8643600 = 3739^2 + 2940^2 .

It is a cyclic number.

It is not a de Polignac number, because 22623721 - 2¹⁹ = 22099433 is a prime.

It is not a weakly prime, because it can be changed into another prime (22623701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11311860 + 11311861.

It is an arithmetic number, because the mean of its divisors is an integer number (11311861).

Almost surely, 2^22623721 is an apocalyptic number.

It is an amenable number.

22623721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22623721 is an equidigital number, since it uses as much as digits as its factorization.

22623721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 22623721 is about 4756.4399502149. The cubic root of 22623721 is about 282.8273116445.

The spelling of 22623721 in words is "twenty-two million, six hundred twenty-three thousand, seven hundred twenty-one".