23213155 has 32 divisors (see below), whose sum is σ = 34076160. Its totient is φ = 14826240.

The previous prime is 23213153. The next prime is 23213161. The reversal of 23213155 is 55131232.

It is not a de Polignac number, because 23213155 - 2¹ = 23213153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23213153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44295 + ... + 44815.

It is an arithmetic number, because the mean of its divisors is an integer number (1064880).

Almost surely, 2^23213155 is an apocalyptic number.

23213155 is a deficient number, since it is larger than the sum of its proper divisors (10863005).

23213155 is a wasteful number, since it uses less digits than its factorization.

23213155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619.

The product of its digits is 900, while the sum is 22.

The square root of 23213155 is about 4818.0032171015. The cubic root of 23213155 is about 285.2625261325.

Adding to 23213155 its reverse (55131232), we get a palindrome (78344387).

It can be divided in two parts, 2321 and 3155, that added together give a square (5476 = 74²).

The spelling of 23213155 in words is "twenty-three million, two hundred thirteen thousand, one hundred fifty-five".