121212222222 has 64 divisors (see below), whose sum is σ = 306432612864. Its totient is φ = 31104051840.

The previous prime is 121212222211. The next prime is 121212222277. The reversal of 121212222222 is 222222212121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

121212222222 is a modest number, since divided by 222222 gives 121212 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2979804 + ... + 3020207.

It is an arithmetic number, because the mean of its divisors is an integer number (4788009576).

Almost surely, 2^121212222222 is an apocalyptic number.

121212222222 is an abundant number, since it is smaller than the sum of its proper divisors (185220390642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121212222222 is a wasteful number, since it uses less digits than its factorization.

121212222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000073.

The product of its digits is 512, while the sum is 21.

Adding to 121212222222 its reverse (222222212121), we get a palindrome (343434434343).

The spelling of 121212222222 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-two".