2222121989 has 4 divisors (see below), whose sum is σ = 2225783424. Its totient is φ = 2218460556.

The previous prime is 2222121947. The next prime is 2222121997. The reversal of 2222121989 is 9891212222.

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 a cyclic number.

It is not a de Polignac number, because 2222121989 - 2¹² = 2222117893 is a prime.

It is a super-2 number, since 2×2222121989² = 9875652267994632242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222121919) 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, 1829807 + ... + 1831020.

It is an arithmetic number, because the mean of its divisors is an integer number (556445856).

Almost surely, 2^2222121989 is an apocalyptic number.

It is an amenable number.

2222121989 is a deficient number, since it is larger than the sum of its proper divisors (3661435).

2222121989 is an equidigital number, since it uses as much as digits as its factorization.

2222121989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661434.

The product of its digits is 20736, while the sum is 38.

The square root of 2222121989 is about 47139.3889332477. The cubic root of 2222121989 is about 1304.9362601047.

The spelling of 2222121989 in words is "two billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred eighty-nine".