1221121121193 has 24 divisors (see below), whose sum is σ = 1768268490560. Its totient is φ = 812038439520.

The previous prime is 1221121121153. The next prime is 1221121121237. The reversal of 1221121121193 is 3911211211221.

It is not a de Polignac number, because 1221121121193 - 2¹⁰ = 1221121120169 is a prime.

It is a super-2 number, since 2×1221121121193² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221121121153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18224130 + ... + 18291012.

Almost surely, 2^{1221121121193} is an apocalyptic number.

It is an amenable number.

1221121121193 is a deficient number, since it is larger than the sum of its proper divisors (547147369367).

1221121121193 is a wasteful number, since it uses less digits than its factorization.

1221121121193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71949 (or 71946 counting only the distinct ones).

The product of its digits is 432, while the sum is 27.

The spelling of 1221121121193 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred ninety-three".