221323210123 has 2 divisors, whose sum is σ = 221323210124. Its totient is φ = 221323210122.

The previous prime is 221323210117. The next prime is 221323210139. The reversal of 221323210123 is 321012323122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221323210123 - 2¹⁷ = 221323079051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221323210094 and 221323210103.

It is not a weakly prime, because it can be changed into another prime (221323210153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661605061 + 110661605062.

It is an arithmetic number, because the mean of its divisors is an integer number (110661605062).

Almost surely, 2^221323210123 is an apocalyptic number.

221323210123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323210123 is an equidigital number, since it uses as much as digits as its factorization.

221323210123 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 221323210123 its reverse (321012323122), we get a palindrome (542335533245).

The spelling of 221323210123 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred ten thousand, one hundred twenty-three".