2156518212 has 24 divisors (see below), whose sum is σ = 5167873536. Its totient is φ = 699411168.

The previous prime is 2156518211. The next prime is 2156518253. The reversal of 2156518212 is 2128156512.

It is not an unprimeable number, because it can be changed into a prime (2156518211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2428068 + ... + 2428955.

It is an arithmetic number, because the mean of its divisors is an integer number (215328064).

Almost surely, 2^2156518212 is an apocalyptic number.

It is an amenable number.

2156518212 is an abundant number, since it is smaller than the sum of its proper divisors (3011355324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156518212 is a wasteful number, since it uses less digits than its factorization.

2156518212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857067 (or 4857065 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 2156518212 is about 46438.3269724481. The cubic root of 2156518212 is about 1291.9658770746.

The spelling of 2156518212 in words is "two billion, one hundred fifty-six million, five hundred eighteen thousand, two hundred twelve".