22221255 has 40 divisors (see below), whose sum is σ = 41544432. Its totient is φ = 10141824.

The previous prime is 22221247. The next prime is 22221259. The reversal of 22221255 is 55212222.

It is not a de Polignac number, because 22221255 - 2³ = 22221247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221259) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 35707 + ... + 36323.

Almost surely, 2^22221255 is an apocalyptic number.

22221255 is a deficient number, since it is larger than the sum of its proper divisors (19323177).

22221255 is an frugal number, since it uses more digits than its factorization.

22221255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 632 counting only the distinct ones).

The product of its digits is 800, while the sum is 21.

The square root of 22221255 is about 4713.9426173852. The cubic root of 22221255 is about 281.1401427740.

Adding to 22221255 its reverse (55212222), we get a palindrome (77433477).

The spelling of 22221255 in words is "twenty-two million, two hundred twenty-one thousand, two hundred fifty-five".