2221991237 has 4 divisors (see below), whose sum is σ = 2222253120. Its totient is φ = 2221729356.

The previous prime is 2221991231. The next prime is 2221991243. The reversal of 2221991237 is 7321991222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2221991231) and next prime (2221991243).

It is a cyclic number.

It is not a de Polignac number, because 2221991237 - 2⁶ = 2221991173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221991237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221991231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117773 + ... + 135330.

It is an arithmetic number, because the mean of its divisors is an integer number (555563280).

Almost surely, 2^2221991237 is an apocalyptic number.

It is an amenable number.

2221991237 is a deficient number, since it is larger than the sum of its proper divisors (261883).

2221991237 is an equidigital number, since it uses as much as digits as its factorization.

2221991237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261882.

The product of its digits is 27216, while the sum is 38.

The square root of 2221991237 is about 47138.0020471806. The cubic root of 2221991237 is about 1304.9106649944.

The spelling of 2221991237 in words is "two billion, two hundred twenty-one million, nine hundred ninety-one thousand, two hundred thirty-seven".