2131218538 has 8 divisors (see below), whose sum is σ = 3197063232. Its totient is φ = 1065530796.

The previous prime is 2131218527. The next prime is 2131218539. The reversal of 2131218538 is 8358121312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2131218539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4431 + ... + 65437.

It is an arithmetic number, because the mean of its divisors is an integer number (399632904).

Almost surely, 2^2131218538 is an apocalyptic number.

2131218538 is a deficient number, since it is larger than the sum of its proper divisors (1065844694).

2131218538 is a wasteful number, since it uses less digits than its factorization.

2131218538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78476.

The product of its digits is 11520, while the sum is 34.

The square root of 2131218538 is about 46165.1225277265. The cubic root of 2131218538 is about 1286.8936612436.

The spelling of 2131218538 in words is "two billion, one hundred thirty-one million, two hundred eighteen thousand, five hundred thirty-eight".