221112122222212 has 24 divisors (see below), whose sum is σ = 441223737105816. Its totient is φ = 96048704675328.

The previous prime is 221112122222209. The next prime is 221112122222227. The reversal of 221112122222212 is 212222221211122.

It can be written as a sum of positive squares in 4 ways, for example, as 17554960338496 + 203557161883716 = 4189864^2 + 14267346^2 .

It is a super-2 number, since 2×221112122222212² (a number of 29 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125063416663 + ... + 125063418430.

It is an arithmetic number, because the mean of its divisors is an integer number (18384322379409).

Almost surely, 2^{221112122222212} is an apocalyptic number.

It is an amenable number.

221112122222212 is a deficient number, since it is larger than the sum of its proper divisors (220111614883604).

221112122222212 is a wasteful number, since it uses less digits than its factorization.

221112122222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250126835127 (or 250126835125 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

Adding to 221112122222212 its reverse (212222221211122), we get a palindrome (433334343433334).

The spelling of 221112122222212 in words is "two hundred twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twelve".