221121002091 has 16 divisors (see below), whose sum is σ = 321650179200. Its totient is φ = 134004549120.

The previous prime is 221121002077. The next prime is 221121002149. The reversal of 221121002091 is 190200121122.

It is not a de Polignac number, because 221121002091 - 2⁵ = 221121002059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121003091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368331 + ... + 760203.

It is an arithmetic number, because the mean of its divisors is an integer number (20103136200).

Almost surely, 2^221121002091 is an apocalyptic number.

221121002091 is a deficient number, since it is larger than the sum of its proper divisors (100529177109).

221121002091 is a wasteful number, since it uses less digits than its factorization.

221121002091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408986.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 221121002091 in words is "two hundred twenty-one billion, one hundred twenty-one million, two thousand, ninety-one".