221131311023 has 4 divisors (see below), whose sum is σ = 252721498320. Its totient is φ = 189541123728.

The previous prime is 221131311013. The next prime is 221131311059. The reversal of 221131311023 is 320113131122.

It is a happy number.

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 221131311023 - 2⁸ = 221131310767 is a prime.

It is a super-2 number, since 2×221131311023² (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 = 221131310986 and 221131311004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221131311013) 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, 15795093638 + ... + 15795093651.

It is an arithmetic number, because the mean of its divisors is an integer number (63180374580).

Almost surely, 2^221131311023 is an apocalyptic number.

221131311023 is a deficient number, since it is larger than the sum of its proper divisors (31590187297).

221131311023 is an equidigital number, since it uses as much as digits as its factorization.

221131311023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31590187296.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 221131311023 its reverse (320113131122), we get a palindrome (541244442145).

The spelling of 221131311023 in words is "two hundred twenty-one billion, one hundred thirty-one million, three hundred eleven thousand, twenty-three".