2131212231138 has 16 divisors (see below), whose sum is σ = 4322458610496. Its totient is φ = 700398385680.

The previous prime is 2131212231121. The next prime is 2131212231139. The reversal of 2131212231138 is 8311322121312.

It is not an unprimeable number, because it can be changed into a prime (2131212231139) 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, 2501422381 + ... + 2501423232.

It is an arithmetic number, because the mean of its divisors is an integer number (270153663156).

Almost surely, 2^{2131212231138} is an apocalyptic number.

2131212231138 is an abundant number, since it is smaller than the sum of its proper divisors (2191246379358).

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

2131212231138 is a wasteful number, since it uses less digits than its factorization.

2131212231138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002845689.

The product of its digits is 3456, while the sum is 30.

The spelling of 2131212231138 in words is "two trillion, one hundred thirty-one billion, two hundred twelve million, two hundred thirty-one thousand, one hundred thirty-eight".