2156233213 has 4 divisors (see below), whose sum is σ = 2156595840. Its totient is φ = 2155870588.

The previous prime is 2156233207. The next prime is 2156233223. The reversal of 2156233213 is 3123326512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156233213 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 (2156233223) 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, 172243 + ... + 184336.

It is an arithmetic number, because the mean of its divisors is an integer number (539148960).

Almost surely, 2^2156233213 is an apocalyptic number.

It is an amenable number.

2156233213 is a deficient number, since it is larger than the sum of its proper divisors (362627).

2156233213 is an equidigital number, since it uses as much as digits as its factorization.

2156233213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362626.

The product of its digits is 6480, while the sum is 28.

The square root of 2156233213 is about 46435.2582958252. The cubic root of 2156233213 is about 1291.9089604512.

Adding to 2156233213 its reverse (3123326512), we get a palindrome (5279559725).

The spelling of 2156233213 in words is "two billion, one hundred fifty-six million, two hundred thirty-three thousand, two hundred thirteen".