221313023 has 4 divisors (see below), whose sum is σ = 221399280. Its totient is φ = 221226768.

The previous prime is 221313017. The next prime is 221313031. The reversal of 221313023 is 320313122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320313122 = 2 ⋅160156561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221313023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221312992 and 221313010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221313073) 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, 39158 + ... + 44451.

It is an arithmetic number, because the mean of its divisors is an integer number (55349820).

Almost surely, 2^221313023 is an apocalyptic number.

221313023 is a deficient number, since it is larger than the sum of its proper divisors (86257).

221313023 is an equidigital number, since it uses as much as digits as its factorization.

221313023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86256.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 221313023 is about 14876.5931247715. The cubic root of 221313023 is about 604.8796728120.

Adding to 221313023 its reverse (320313122), we get a palindrome (541626145).

Subtracting 221313023 from its reverse (320313122), we obtain a palindrome (99000099).

The spelling of 221313023 in words is "two hundred twenty-one million, three hundred thirteen thousand, twenty-three".