221031023131 has 4 divisors (see below), whose sum is σ = 221089516200. Its totient is φ = 220972530064.

The previous prime is 221031023111. The next prime is 221031023153. The reversal of 221031023131 is 131320130122.

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 221031023131 - 2²⁷ = 220896805403 is a prime.

It is a super-2 number, since 2×221031023131² (a number of 23 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 = 221031023099 and 221031023108.

It is not an unprimeable number, because it can be changed into a prime (221031023111) 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, 29240866 + ... + 29248423.

It is an arithmetic number, because the mean of its divisors is an integer number (55272379050).

Almost surely, 2^221031023131 is an apocalyptic number.

221031023131 is a deficient number, since it is larger than the sum of its proper divisors (58493069).

221031023131 is an equidigital number, since it uses as much as digits as its factorization.

221031023131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58493068.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 221031023131 its reverse (131320130122), we get a palindrome (352351153253).

It can be divided in two parts, 2210310 and 23131, that added together give a triangular number (2233441 = T₂₁₁₃).

The spelling of 221031023131 in words is "two hundred twenty-one billion, thirty-one million, twenty-three thousand, one hundred thirty-one".