22721573 has 4 divisors (see below), whose sum is σ = 25967520. Its totient is φ = 19475628.

The previous prime is 22721563. The next prime is 22721579. The reversal of 22721573 is 37512722.

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 22721573 - 2⁸ = 22721317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22721579) 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, 1622963 + ... + 1622976.

It is an arithmetic number, because the mean of its divisors is an integer number (6491880).

Almost surely, 2^22721573 is an apocalyptic number.

It is an amenable number.

22721573 is a deficient number, since it is larger than the sum of its proper divisors (3245947).

22721573 is an equidigital number, since it uses as much as digits as its factorization.

22721573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245946.

The product of its digits is 5880, while the sum is 29.

The square root of 22721573 is about 4766.7151163039. The cubic root of 22721573 is about 283.2344862418.

The spelling of 22721573 in words is "twenty-two million, seven hundred twenty-one thousand, five hundred seventy-three".