2156312122 has 8 divisors (see below), whose sum is σ = 3321886356. Its totient is φ = 1049016672.

The previous prime is 2156312087. The next prime is 2156312129. The reversal of 2156312122 is 2212136512.

It can be written as a sum of positive squares in 2 ways, for example, as 2069431081 + 86881041 = 45491^2 + 9321^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2156312129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14569603 + ... + 14569750.

Almost surely, 2^2156312122 is an apocalyptic number.

2156312122 is a deficient number, since it is larger than the sum of its proper divisors (1165574234).

2156312122 is a wasteful number, since it uses less digits than its factorization.

2156312122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29139392.

The product of its digits is 1440, while the sum is 25.

The square root of 2156312122 is about 46436.1079549094. The cubic root of 2156312122 is about 1291.9247197237.

Adding to 2156312122 its reverse (2212136512), we get a palindrome (4368448634).

The spelling of 2156312122 in words is "two billion, one hundred fifty-six million, three hundred twelve thousand, one hundred twenty-two".