231100220231 has 4 divisors (see below), whose sum is σ = 231104979000. Its totient is φ = 231095461464.

The previous prime is 231100220207. The next prime is 231100220269. The reversal of 231100220231 is 132022001132.

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-231100220231 is a prime.

It is a super-2 number, since 2×231100220231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231100223231) 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, 2305781 + ... + 2403918.

It is an arithmetic number, because the mean of its divisors is an integer number (57776244750).

Almost surely, 2^231100220231 is an apocalyptic number.

231100220231 is a deficient number, since it is larger than the sum of its proper divisors (4758769).

231100220231 is an equidigital number, since it uses as much as digits as its factorization.

231100220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758768.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 231100220231 its reverse (132022001132), we get a palindrome (363122221363).

The spelling of 231100220231 in words is "two hundred thirty-one billion, one hundred million, two hundred twenty thousand, two hundred thirty-one".