22155 has 16 divisors (see below), whose sum is σ = 40704. Its totient is φ = 10080.

The previous prime is 22153. The next prime is 22157. The reversal of 22155 is 55122.

22155 is a nontrivial binomial coefficient, being equal to C(211, 2).

It is an interprime number because it is at equal distance from previous prime (22153) and next prime (22157).

It is not a de Polignac number, because 22155 - 2¹ = 22153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

22155 is a lucky number.

It is a plaindrome in base 9 and base 16.

It is not an unprimeable number, because it can be changed into a prime (22153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1 + ... + 210.

It is an arithmetic number, because the mean of its divisors is an integer number (2544).

2²²¹⁵⁵ is an apocalyptic number.

22155 is the 210-th triangular number.

22155 is a deficient number, since it is larger than the sum of its proper divisors (18549).

22155 is a wasteful number, since it uses less digits than its factorization.

22155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its digits is 100, while the sum is 15.

The square root of 22155 is about 148.8455575420. The cubic root of 22155 is about 28.0860448346.

Adding to 22155 its reverse (55122), we get a palindrome (77277).

It can be divided in two parts, 221 and 55, that added together give a triangular number (276 = T₂₃).

The spelling of 22155 in words is "twenty-two thousand, one hundred fifty-five".