212221001091 has 24 divisors (see below), whose sum is σ = 311083773952. Its totient is φ = 128593911600.

The previous prime is 212221001053. The next prime is 212221001099. The reversal of 212221001091 is 190100122212.

It is not a de Polignac number, because 212221001091 - 2⁷ = 212221000963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212221001099) 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, 1917630 + ... + 2025276.

Almost surely, 2^212221001091 is an apocalyptic number.

212221001091 is a deficient number, since it is larger than the sum of its proper divisors (98862772861).

212221001091 is a wasteful number, since it uses less digits than its factorization.

212221001091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113103 (or 113092 counting only the distinct ones).

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

The spelling of 212221001091 in words is "two hundred twelve billion, two hundred twenty-one million, one thousand, ninety-one".