2155218132 has 24 divisors (see below), whose sum is σ = 5033482272. Its totient is φ = 717743200.

The previous prime is 2155218119. The next prime is 2155218133. The reversal of 2155218132 is 2318125512.

It is a self number, because there is not a number n which added to its sum of digits gives 2155218132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155218133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69219 + ... + 95402.

It is an arithmetic number, because the mean of its divisors is an integer number (209728428).

Almost surely, 2^2155218132 is an apocalyptic number.

It is an amenable number.

2155218132 is an abundant number, since it is smaller than the sum of its proper divisors (2878264140).

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

2155218132 is a wasteful number, since it uses less digits than its factorization.

2155218132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165719 (or 165717 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 2155218132 is about 46424.3269418093. The cubic root of 2155218132 is about 1291.7061997492.

The spelling of 2155218132 in words is "two billion, one hundred fifty-five million, two hundred eighteen thousand, one hundred thirty-two".