231120212131 has 4 divisors (see below), whose sum is σ = 231206357272. Its totient is φ = 231034066992.

The previous prime is 231120212111. The next prime is 231120212137. The reversal of 231120212131 is 131212021132.

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

It is a cyclic number.

It is not a de Polignac number, because 231120212131 - 2¹⁵ = 231120179363 is a prime.

It is a super-2 number, since 2×231120212131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231120212099 and 231120212108.

It is not an unprimeable number, because it can be changed into a prime (231120212137) 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, 43068546 + ... + 43073911.

It is an arithmetic number, because the mean of its divisors is an integer number (57801589318).

Almost surely, 2^231120212131 is an apocalyptic number.

231120212131 is a deficient number, since it is larger than the sum of its proper divisors (86145141).

231120212131 is an equidigital number, since it uses as much as digits as its factorization.

231120212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86145140.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 231120212131 its reverse (131212021132), we get a palindrome (362332233263).

The spelling of 231120212131 in words is "two hundred thirty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred thirty-one".