2131212231205 has 32 divisors (see below), whose sum is σ = 2758020451200. Its totient is φ = 1575231854592.

The previous prime is 2131212231139. The next prime is 2131212231223. The reversal of 2131212231205 is 5021322121312.

It is a cyclic number.

It is not a de Polignac number, because 2131212231205 - 2⁷ = 2131212231077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2131212231205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38154 + ... + 2064916.

It is an arithmetic number, because the mean of its divisors is an integer number (86188139100).

Almost surely, 2^{2131212231205} is an apocalyptic number.

It is an amenable number.

2131212231205 is a deficient number, since it is larger than the sum of its proper divisors (626808219995).

2131212231205 is a wasteful number, since it uses less digits than its factorization.

2131212231205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027013.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 2131212231205 its reverse (5021322121312), we get a palindrome (7152534352517).

The spelling of 2131212231205 in words is "two trillion, one hundred thirty-one billion, two hundred twelve million, two hundred thirty-one thousand, two hundred five".