1221010111102 has 16 divisors (see below), whose sum is σ = 1951138546560. Its totient is φ = 571404857112.

The previous prime is 1221010111099. The next prime is 1221010111147. The reversal of 1221010111102 is 2011110101221.

It is a happy number.

It is a congruent number.

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, 193562178 + ... + 193568485.

It is an arithmetic number, because the mean of its divisors is an integer number (121946159160).

Almost surely, 2^{1221010111102} is an apocalyptic number.

1221010111102 is a deficient number, since it is larger than the sum of its proper divisors (730128435458).

1221010111102 is a wasteful number, since it uses less digits than its factorization.

1221010111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387130767.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221010111102 its reverse (2011110101221), we get a palindrome (3232120212323).

The spelling of 1221010111102 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred eleven thousand, one hundred two".