2155510123320 has 64 divisors (see below), whose sum is σ = 6641301474720. Its totient is φ = 559267490304.

The previous prime is 2155510123307. The next prime is 2155510123339. The reversal of 2155510123320 is 233210155512.

It is a super-3 number, since 3×2155510123320³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242733187 + ... + 242742066.

Almost surely, 2^{2155510123320} is an apocalyptic number.

2155510123320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155510123320 is an abundant number, since it is smaller than the sum of its proper divisors (4485791351400).

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

2155510123320 is a wasteful number, since it uses less digits than its factorization.

2155510123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485475304 (or 485475300 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 2155510123320 its reverse (233210155512), we get a palindrome (2388720278832).

The spelling of 2155510123320 in words is "two trillion, one hundred fifty-five billion, five hundred ten million, one hundred twenty-three thousand, three hundred twenty".