22721255 has 8 divisors (see below), whose sum is σ = 27572400. Its totient is φ = 17972416.

The previous prime is 22721227. The next prime is 22721261. The reversal of 22721255 is 55212722.

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 22721255 - 2⁶ = 22721191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25085 + ... + 25974.

It is an arithmetic number, because the mean of its divisors is an integer number (3446550).

Almost surely, 2^22721255 is an apocalyptic number.

22721255 is a deficient number, since it is larger than the sum of its proper divisors (4851145).

22721255 is an equidigital number, since it uses as much as digits as its factorization.

22721255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51153.

The product of its digits is 2800, while the sum is 26.

The square root of 22721255 is about 4766.6817598829. The cubic root of 22721255 is about 283.2331648986.

Adding to 22721255 its reverse (55212722), we get a palindrome (77933977).

The spelling of 22721255 in words is "twenty-two million, seven hundred twenty-one thousand, two hundred fifty-five".