221131023 has 4 divisors (see below), whose sum is σ = 294841368. Its totient is φ = 147420680.

The previous prime is 221130977. The next prime is 221131073. The reversal of 221131023 is 320131122.

221131023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221131023 - 2¹⁴ = 221114639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221130993 and 221131011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221131073) 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, 36855168 + ... + 36855173.

It is an arithmetic number, because the mean of its divisors is an integer number (73710342).

Almost surely, 2^221131023 is an apocalyptic number.

221131023 is a deficient number, since it is larger than the sum of its proper divisors (73710345).

221131023 is an equidigital number, since it uses as much as digits as its factorization.

221131023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73710344.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221131023 is about 14870.4748747308. The cubic root of 221131023 is about 604.7138167916.

Adding to 221131023 its reverse (320131122), we get a palindrome (541262145).

Subtracting 221131023 from its reverse (320131122), we obtain a palindrome (99000099).

The spelling of 221131023 in words is "two hundred twenty-one million, one hundred thirty-one thousand, twenty-three".