222121155 has 16 divisors (see below), whose sum is σ = 355578624. Its totient is φ = 118403040.

The previous prime is 222121129. The next prime is 222121171. The reversal of 222121155 is 551121222.

It is not a de Polignac number, because 222121155 - 2¹³ = 222112963 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54540 + ... + 58470.

It is an arithmetic number, because the mean of its divisors is an integer number (22223664).

Almost surely, 2^222121155 is an apocalyptic number.

222121155 is a deficient number, since it is larger than the sum of its proper divisors (133457469).

222121155 is a wasteful number, since it uses less digits than its factorization.

222121155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7706.

The product of its digits is 400, while the sum is 21.

The square root of 222121155 is about 14903.7295667896. The cubic root of 222121155 is about 605.6150246876.

Adding to 222121155 its reverse (551121222), we get a palindrome (773242377).

The spelling of 222121155 in words is "two hundred twenty-two million, one hundred twenty-one thousand, one hundred fifty-five".