221223797 has 4 divisors (see below), whose sum is σ = 221322816. Its totient is φ = 221124780.

The previous prime is 221223733. The next prime is 221223809. The reversal of 221223797 is 797322122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 797322122 = 2 ⋅398661061.

It is a cyclic number.

It is not a de Polignac number, because 221223797 - 2⁶ = 221223733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223697) 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, 46079 + ... + 50652.

It is an arithmetic number, because the mean of its divisors is an integer number (55330704).

Almost surely, 2^221223797 is an apocalyptic number.

It is an amenable number.

221223797 is a deficient number, since it is larger than the sum of its proper divisors (99019).

221223797 is an equidigital number, since it uses as much as digits as its factorization.

221223797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99018.

The product of its digits is 21168, while the sum is 35.

The square root of 221223797 is about 14873.5939503538. The cubic root of 221223797 is about 604.7983728088.

The spelling of 221223797 in words is "two hundred twenty-one million, two hundred twenty-three thousand, seven hundred ninety-seven".