221323023121 has 2 divisors, whose sum is σ = 221323023122. Its totient is φ = 221323023120.

The previous prime is 221323023091. The next prime is 221323023157. The reversal of 221323023121 is 121320323122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145939280400 + 75383742721 = 382020^2 + 274561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221323023121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221323023092 and 221323023101.

It is not a weakly prime, because it can be changed into another prime (221323023421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661511560 + 110661511561.

It is an arithmetic number, because the mean of its divisors is an integer number (110661511561).

Almost surely, 2^221323023121 is an apocalyptic number.

It is an amenable number.

221323023121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323023121 is an equidigital number, since it uses as much as digits as its factorization.

221323023121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221323023121 its reverse (121320323122), we get a palindrome (342643346243).

The spelling of 221323023121 in words is "two hundred twenty-one billion, three hundred twenty-three million, twenty-three thousand, one hundred twenty-one".