1221211121094 has 16 divisors (see below), whose sum is σ = 2713802491440. Its totient is φ = 407070373680.

The previous prime is 1221211120991. The next prime is 1221211121099. The reversal of 1221211121094 is 4901211121221.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211121099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11307510327 + ... + 11307510434.

It is an arithmetic number, because the mean of its divisors is an integer number (169612655715).

Almost surely, 2^{1221211121094} is an apocalyptic number.

1221211121094 is an abundant number, since it is smaller than the sum of its proper divisors (1492591370346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221211121094 is a wasteful number, since it uses less digits than its factorization.

1221211121094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22615020772 (or 22615020766 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The spelling of 1221211121094 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, ninety-four".