22155121 has 8 divisors (see below), whose sum is σ = 23386400. Its totient is φ = 20930400.

The previous prime is 22155103. The next prime is 22155127. The reversal of 22155121 is 12155122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22155121 - 2¹¹ = 22153073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22155127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6346 + ... + 9196.

It is an arithmetic number, because the mean of its divisors is an integer number (2923300).

Almost surely, 2^22155121 is an apocalyptic number.

It is an amenable number.

22155121 is a deficient number, since it is larger than the sum of its proper divisors (1231279).

22155121 is a wasteful number, since it uses less digits than its factorization.

22155121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279.

The product of its digits is 200, while the sum is 19.

The square root of 22155121 is about 4706.9226677310. The cubic root of 22155121 is about 280.8609596536.

Subtracting from 22155121 its reverse (12155122), we obtain a palindrome (9999999).

The spelling of 22155121 in words is "twenty-two million, one hundred fifty-five thousand, one hundred twenty-one".