213111022231 has 4 divisors (see below), whose sum is σ = 220459678200. Its totient is φ = 205762366264.

The previous prime is 213111022217. The next prime is 213111022249. The reversal of 213111022231 is 132220111312.

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 213111022231 - 2³⁵ = 178751283863 is a prime.

It is a super-2 number, since 2×213111022231² (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 = 213111022199 and 213111022208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213111022291) 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, 3674327941 + ... + 3674327998.

It is an arithmetic number, because the mean of its divisors is an integer number (55114919550).

Almost surely, 2^213111022231 is an apocalyptic number.

213111022231 is a deficient number, since it is larger than the sum of its proper divisors (7348655969).

213111022231 is an equidigital number, since it uses as much as digits as its factorization.

213111022231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348655968.

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

Adding to 213111022231 its reverse (132220111312), we get a palindrome (345331133543).

The spelling of 213111022231 in words is "two hundred thirteen billion, one hundred eleven million, twenty-two thousand, two hundred thirty-one".