2131515020 has 12 divisors (see below), whose sum is σ = 4476181584. Its totient is φ = 852606000.

The previous prime is 2131515013. The next prime is 2131515077. The reversal of 2131515020 is 205151312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 106575751 = 2131515020 / (2 + 1 + 3 + 1 + 5 + 1 + 5 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2131514983 and 2131515001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53287856 + ... + 53287895.

It is an arithmetic number, because the mean of its divisors is an integer number (373015132).

Almost surely, 2^2131515020 is an apocalyptic number.

2131515020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131515020 is an abundant number, since it is smaller than the sum of its proper divisors (2344666564).

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

2131515020 is a wasteful number, since it uses less digits than its factorization.

2131515020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106575760 (or 106575758 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2131515020 is about 46168.3335198489. Note that the first 3 decimals coincide. The cubic root of 2131515020 is about 1286.9533333840.

Adding to 2131515020 its reverse (205151312), we get a palindrome (2336666332).

The spelling of 2131515020 in words is "two billion, one hundred thirty-one million, five hundred fifteen thousand, twenty".