2211166121 has 4 divisors (see below), whose sum is σ = 2265097044. Its totient is φ = 2157235200.

The previous prime is 2211166117. The next prime is 2211166123. The reversal of 2211166121 is 1216611122.

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 1067982400 + 1143183721 = 32680^2 + 33811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211166121 - 2² = 2211166117 is a prime.

It is a super-2 number, since 2×2211166121² = 9778511229316373282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2211166123) 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, 26965400 + ... + 26965481.

It is an arithmetic number, because the mean of its divisors is an integer number (566274261).

Almost surely, 2^2211166121 is an apocalyptic number.

It is an amenable number.

2211166121 is a deficient number, since it is larger than the sum of its proper divisors (53930923).

2211166121 is an equidigital number, since it uses as much as digits as its factorization.

2211166121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53930922.

The product of its digits is 288, while the sum is 23.

The square root of 2211166121 is about 47023.0381940597. The cubic root of 2211166121 is about 1302.7881227171.

Adding to 2211166121 its reverse (1216611122), we get a palindrome (3427777243).

The spelling of 2211166121 in words is "two billion, two hundred eleven million, one hundred sixty-six thousand, one hundred twenty-one".