2155120072 has 32 divisors (see below), whose sum is σ = 4619603520. Its totient is φ = 923325120.

The previous prime is 2155120069. The next prime is 2155120091. The reversal of 2155120072 is 2700215512.

It is an unprimeable number.

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, 340198 + ... + 346474.

It is an arithmetic number, because the mean of its divisors is an integer number (144362610).

Almost surely, 2^2155120072 is an apocalyptic number.

It is an amenable number.

2155120072 is an abundant number, since it is smaller than the sum of its proper divisors (2464483448).

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

2155120072 is a wasteful number, since it uses less digits than its factorization.

2155120072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12421 (or 12417 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 2155120072 is about 46423.2708024758. The cubic root of 2155120072 is about 1291.6866090592.

Adding to 2155120072 its reverse (2700215512), we get a palindrome (4855335584).

The spelling of 2155120072 in words is "two billion, one hundred fifty-five million, one hundred twenty thousand, seventy-two".