2145506115220 has 24 divisors (see below), whose sum is σ = 4852144599624. Its totient is φ = 792186873216.

The previous prime is 2145506115209. The next prime is 2145506115223. The reversal of 2145506115220 is 225116055412.

It can be written as a sum of positive squares in 4 ways, for example, as 12229705744 + 2133276409476 = 110588^2 + 1460574^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145506115223) 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, 4125973039 + ... + 4125973558.

It is an arithmetic number, because the mean of its divisors is an integer number (202172691651).

Almost surely, 2^{2145506115220} is an apocalyptic number.

2145506115220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145506115220 is an abundant number, since it is smaller than the sum of its proper divisors (2706638484404).

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

2145506115220 is a wasteful number, since it uses less digits than its factorization.

2145506115220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8251946619 (or 8251946617 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 2145506115220 in words is "two trillion, one hundred forty-five billion, five hundred six million, one hundred fifteen thousand, two hundred twenty".