2221021191 has 4 divisors (see below), whose sum is σ = 2961361592. Its totient is φ = 1480680792.

The previous prime is 2221021189. The next prime is 2221021249. The reversal of 2221021191 is 1911201222.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2221021191 - 2¹ = 2221021189 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 (2221021141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370170196 + ... + 370170201.

It is an arithmetic number, because the mean of its divisors is an integer number (740340398).

Almost surely, 2^2221021191 is an apocalyptic number.

2221021191 is a deficient number, since it is larger than the sum of its proper divisors (740340401).

2221021191 is an equidigital number, since it uses as much as digits as its factorization.

2221021191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740340400.

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

The square root of 2221021191 is about 47127.7114975892. The cubic root of 2221021191 is about 1304.7207441102.

The spelling of 2221021191 in words is "two billion, two hundred twenty-one million, twenty-one thousand, one hundred ninety-one".