1221111122212 has 12 divisors (see below), whose sum is σ = 2139013149196. Its totient is φ = 609964508160.

The previous prime is 1221111122207. The next prime is 1221111122263. The reversal of 1221111122212 is 2122211111221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1089881712676 + 131229409536 = 1043974^2 + 362256^2 .

It is a super-2 number, since 2×1221111122212² (a number of 25 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1221111122212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147758589 + ... + 147766852.

Almost surely, 2^{1221111122212} is an apocalyptic number.

It is an amenable number.

1221111122212 is a deficient number, since it is larger than the sum of its proper divisors (917902026984).

1221111122212 is a wasteful number, since it uses less digits than its factorization.

1221111122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295526478 (or 295526476 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

Adding to 1221111122212 its reverse (2122211111221), we get a palindrome (3343322233433).

The spelling of 1221111122212 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twelve".