212311122131 has 4 divisors (see below), whose sum is σ = 212372328000. Its totient is φ = 212249916264.

The previous prime is 212311122103. The next prime is 212311122143. The reversal of 212311122131 is 131221113212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212311122131 is a prime.

It is a super-2 number, since 2×212311122131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212311121131) 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, 30597731 + ... + 30604668.

It is an arithmetic number, because the mean of its divisors is an integer number (53093082000).

Almost surely, 2^212311122131 is an apocalyptic number.

212311122131 is a deficient number, since it is larger than the sum of its proper divisors (61205869).

212311122131 is an equidigital number, since it uses as much as digits as its factorization.

212311122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61205868.

The product of its digits is 144, while the sum is 20.

Adding to 212311122131 its reverse (131221113212), we get a palindrome (343532235343).

The spelling of 212311122131 in words is "two hundred twelve billion, three hundred eleven million, one hundred twenty-two thousand, one hundred thirty-one".