222212121 has 8 divisors (see below), whose sum is σ = 304290624. Its totient is φ = 144137520.

The previous prime is 222212063. The next prime is 222212129. The reversal of 222212121 is 121212222.

222212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 222212121 - 2¹³ = 222203929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222212121.

It is not an unprimeable number, because it can be changed into a prime (222212129) 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, 1000845 + ... + 1001066.

It is an arithmetic number, because the mean of its divisors is an integer number (38036328).

Almost surely, 2^222212121 is an apocalyptic number.

It is an amenable number.

222212121 is a deficient number, since it is larger than the sum of its proper divisors (82078503).

222212121 is a wasteful number, since it uses less digits than its factorization.

222212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001951.

The product of its digits is 64, while the sum is 15.

The square root of 222212121 is about 14906.7810408552. The cubic root of 222212121 is about 605.6976865689.

Adding to 222212121 its reverse (121212222), we get a palindrome (343424343).

It can be divided in two parts, 22221 and 2121, that added together give a palindrome (24342).

The spelling of 222212121 in words is "two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".