2161211311 has 8 divisors (see below), whose sum is σ = 2530198944. Its totient is φ = 1807284480.

The previous prime is 2161211291. The next prime is 2161211333. The reversal of 2161211311 is 1131121612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161211311 - 2⁵ = 2161211279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161211111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3764890 + ... + 3765463.

It is an arithmetic number, because the mean of its divisors is an integer number (316274868).

Almost surely, 2^2161211311 is an apocalyptic number.

2161211311 is a deficient number, since it is larger than the sum of its proper divisors (368987633).

2161211311 is an equidigital number, since it uses as much as digits as its factorization.

2161211311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530401.

The product of its digits is 72, while the sum is 19.

The square root of 2161211311 is about 46488.8299594645. The cubic root of 2161211311 is about 1292.9024068672.

Adding to 2161211311 its reverse (1131121612), we get a palindrome (3292332923).

It can be divided in two parts, 21612 and 11311, that added together give a palindrome (32923).

The spelling of 2161211311 in words is "two billion, one hundred sixty-one million, two hundred eleven thousand, three hundred eleven".