221121999999 has 12 divisors (see below), whose sum is σ = 326826315816. Its totient is φ = 143986418352.

The previous prime is 221121999997. The next prime is 221122000009. The reversal of 221121999999 is 999999121122.

It is not a de Polignac number, because 221121999999 - 2¹ = 221121999997 is a prime.

221121999999 is a modest number, since divided by 999999 gives 221121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121999997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285686952 + ... + 285687725.

It is an arithmetic number, because the mean of its divisors is an integer number (27235526318).

Almost surely, 2^221121999999 is an apocalyptic number.

221121999999 is a deficient number, since it is larger than the sum of its proper divisors (105704315817).

221121999999 is a wasteful number, since it uses less digits than its factorization.

221121999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571374726 (or 571374723 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 63.

The spelling of 221121999999 in words is "two hundred twenty-one billion, one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".