222012155 has 4 divisors (see below), whose sum is σ = 266414592. Its totient is φ = 177609720.

The previous prime is 222012151. The next prime is 222012157. The reversal of 222012155 is 551210222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 222012155 - 2² = 222012151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222012151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22201211 + ... + 22201220.

It is an arithmetic number, because the mean of its divisors is an integer number (66603648).

Almost surely, 2^222012155 is an apocalyptic number.

222012155 is a deficient number, since it is larger than the sum of its proper divisors (44402437).

222012155 is an equidigital number, since it uses as much as digits as its factorization.

222012155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44402436.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 222012155 is about 14900.0723152608. The cubic root of 222012155 is about 605.5159453683.

Adding to 222012155 its reverse (551210222), we get a palindrome (773222377).

The spelling of 222012155 in words is "two hundred twenty-two million, twelve thousand, one hundred fifty-five".