123133100221 has 4 divisors (see below), whose sum is σ = 127105135744. Its totient is φ = 119161064700.

The previous prime is 123133100203. The next prime is 123133100243. The reversal of 123133100221 is 122001331321.

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.

It is a cyclic number.

It is not a de Polignac number, because 123133100221 - 2⁹ = 123133099709 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 (123133100201) 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, 1986017715 + ... + 1986017776.

It is an arithmetic number, because the mean of its divisors is an integer number (31776283936).

Almost surely, 2^123133100221 is an apocalyptic number.

It is an amenable number.

123133100221 is a deficient number, since it is larger than the sum of its proper divisors (3972035523).

123133100221 is an equidigital number, since it uses as much as digits as its factorization.

123133100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972035522.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 123133100221 its reverse (122001331321), we get a palindrome (245134431542).

The spelling of 123133100221 in words is "one hundred twenty-three billion, one hundred thirty-three million, one hundred thousand, two hundred twenty-one".