2131121242987 has 8 divisors (see below), whose sum is σ = 2325264563952. Its totient is φ = 1937045426400.

The previous prime is 2131121242949. The next prime is 2131121242997. The reversal of 2131121242987 is 7892421211312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131121242987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2131121242907) 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, 16810068 + ... + 16936369.

It is an arithmetic number, because the mean of its divisors is an integer number (290658070494).

Almost surely, 2^{2131121242987} is an apocalyptic number.

2131121242987 is a deficient number, since it is larger than the sum of its proper divisors (194143320965).

2131121242987 is a wasteful number, since it uses less digits than its factorization.

2131121242987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33752189.

The product of its digits is 96768, while the sum is 43.

The spelling of 2131121242987 in words is "two trillion, one hundred thirty-one billion, one hundred twenty-one million, two hundred forty-two thousand, nine hundred eighty-seven".