2155120889090 has 24 divisors (see below), whose sum is σ = 4200572907828. Its totient is φ = 795736943040.

The previous prime is 2155120889087. The next prime is 2155120889099. The reversal of 2155120889090 is 909880215512.

It is a Cunningham number, because it is equal to 1468033²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 775842110761 + 1379278778329 = 880819^2 + 1174427^2 .

It is not an unprimeable number, because it can be changed into a prime (2155120889099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637608041 + ... + 637611420.

Almost surely, 2^{2155120889090} is an apocalyptic number.

2155120889090 is a deficient number, since it is larger than the sum of its proper divisors (2045452018738).

2155120889090 is a wasteful number, since it uses less digits than its factorization.

2155120889090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275219494 (or 1275219481 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 50.

The spelling of 2155120889090 in words is "two trillion, one hundred fifty-five billion, one hundred twenty million, eight hundred eighty-nine thousand, ninety".