2222121145 has 4 divisors (see below), whose sum is σ = 2666545380. Its totient is φ = 1777696912.

The previous prime is 2222121127. The next prime is 2222121227. The reversal of 2222121145 is 5411212222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 230462761 + 1991658384 = 15181^2 + 44628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222121145 - 2⁵ = 2222121113 is a prime.

It is a super-2 number, since 2×2222121145² = 9875644766112222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222212110 + ... + 222212119.

It is an arithmetic number, because the mean of its divisors is an integer number (666636345).

Almost surely, 2^2222121145 is an apocalyptic number.

It is an amenable number.

2222121145 is a deficient number, since it is larger than the sum of its proper divisors (444424235).

2222121145 is an equidigital number, since it uses as much as digits as its factorization.

2222121145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444424234.

The product of its digits is 640, while the sum is 22.

The square root of 2222121145 is about 47139.3799810731. The cubic root of 2222121145 is about 1304.9360948923.

Adding to 2222121145 its reverse (5411212222), we get a palindrome (7633333367).

The spelling of 2222121145 in words is "two billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred forty-five".