2221888991 has 8 divisors (see below), whose sum is σ = 2598355584. Its totient is φ = 1860185880.

The previous prime is 2221888979. The next prime is 2221889029. The reversal of 2221888991 is 1998881222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2221888991 - 2³⁰ = 1148147167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221888091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3690545 + ... + 3691146.

It is an arithmetic number, because the mean of its divisors is an integer number (324794448).

Almost surely, 2^2221888991 is an apocalyptic number.

2221888991 is a deficient number, since it is larger than the sum of its proper divisors (376466593).

2221888991 is an equidigital number, since it uses as much as digits as its factorization.

2221888991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7381741.

The product of its digits is 331776, while the sum is 50.

The square root of 2221888991 is about 47136.9174957379. The cubic root of 2221888991 is about 1304.8906493225.

The spelling of 2221888991 in words is "two billion, two hundred twenty-one million, eight hundred eighty-eight thousand, nine hundred ninety-one".