2131520236 has 12 divisors (see below), whose sum is σ = 3731311528. Its totient is φ = 1065431232.

The previous prime is 2131520233. The next prime is 2131520249. The reversal of 2131520236 is 6320251312.

It is a self number, because there is not a number n which added to its sum of digits gives 2131520236.

It is not an unprimeable number, because it can be changed into a prime (2131520233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67341 + ... + 93796.

Almost surely, 2^2131520236 is an apocalyptic number.

It is an amenable number.

2131520236 is a deficient number, since it is larger than the sum of its proper divisors (1599791292).

2131520236 is a wasteful number, since it uses less digits than its factorization.

2131520236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164448 (or 164446 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 2131520236 is about 46168.3900087495. The cubic root of 2131520236 is about 1286.9543831448.

Adding to 2131520236 its reverse (6320251312), we get a palindrome (8451771548).

The spelling of 2131520236 in words is "two billion, one hundred thirty-one million, five hundred twenty thousand, two hundred thirty-six".