1221111102212 has 12 divisors (see below), whose sum is σ = 2262647042460. Its totient is φ = 574640518656.

The previous prime is 1221111102203. The next prime is 1221111102247. The reversal of 1221111102212 is 2122011111221.

It can be written as a sum of positive squares in 2 ways, for example, as 793125611776 + 427985490436 = 890576^2 + 654206^2 .

It is a super-2 number, since 2×1221111102212² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 8978758037 + ... + 8978758172.

It is an arithmetic number, because the mean of its divisors is an integer number (188553920205).

Almost surely, 2^{1221111102212} is an apocalyptic number.

It is an amenable number.

1221111102212 is a deficient number, since it is larger than the sum of its proper divisors (1041535940248).

1221111102212 is a wasteful number, since it uses less digits than its factorization.

1221111102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17957516230 (or 17957516228 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221111102212 its reverse (2122011111221), we get a palindrome (3343122213433).

Subtracting 1221111102212 from its reverse (2122011111221), we obtain a palindrome (900900009009).

The spelling of 1221111102212 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred two thousand, two hundred twelve".