2156731022213 has 16 divisors (see below), whose sum is σ = 2193450598080. Its totient is φ = 2120276660736.

The previous prime is 2156731022209. The next prime is 2156731022249. The reversal of 2156731022213 is 3122201376512.

It is a cyclic number.

It is not a de Polignac number, because 2156731022213 - 2² = 2156731022209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156731022113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38200181 + ... + 38256597.

It is an arithmetic number, because the mean of its divisors is an integer number (137090662380).

Almost surely, 2^{2156731022213} is an apocalyptic number.

It is an amenable number.

2156731022213 is a deficient number, since it is larger than the sum of its proper divisors (36719575867).

2156731022213 is a wasteful number, since it uses less digits than its factorization.

2156731022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58756.

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 2156731022213 its reverse (3122201376512), we get a palindrome (5278932398725).

The spelling of 2156731022213 in words is "two trillion, one hundred fifty-six billion, seven hundred thirty-one million, twenty-two thousand, two hundred thirteen".