121221011111012 has 24 divisors (see below), whose sum is σ = 214536137480280. Its totient is φ = 59925072204800.

The previous prime is 121221011111009. The next prime is 121221011111027. The reversal of 121221011111012 is 210111110122121.

It can be written as a sum of positive squares in 4 ways, for example, as 62936550761536 + 58284460349476 = 7933256^2 + 7634426^2 .

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, 7706489 + ... + 17373312.

It is an arithmetic number, because the mean of its divisors is an integer number (8939005728345).

Almost surely, 2^{121221011111012} is an apocalyptic number.

It is an amenable number.

121221011111012 is a deficient number, since it is larger than the sum of its proper divisors (93315126369268).

121221011111012 is a wasteful number, since it uses less digits than its factorization.

121221011111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25093471 (or 25093469 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121221011111012 its reverse (210111110122121), we get a palindrome (331332121233133).

The spelling of 121221011111012 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred eleven thousand, twelve".