2156245212 has 24 divisors (see below), whose sum is σ = 5488624512. Its totient is φ = 653407600.

The previous prime is 2156245199. The next prime is 2156245219. The reversal of 2156245212 is 2125426512.

It is a self number, because there is not a number n which added to its sum of digits gives 2156245212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156245219) 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, 8167464 + ... + 8167727.

It is an arithmetic number, because the mean of its divisors is an integer number (228692688).

Almost surely, 2^2156245212 is an apocalyptic number.

2156245212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2156245212 is an abundant number, since it is smaller than the sum of its proper divisors (3332379300).

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

2156245212 is a wasteful number, since it uses less digits than its factorization.

2156245212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16335209 (or 16335207 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 2156245212 is about 46435.3874970372. The cubic root of 2156245212 is about 1291.9113568504.

The spelling of 2156245212 in words is "two billion, one hundred fifty-six million, two hundred forty-five thousand, two hundred twelve".