123003011221 has 4 divisors (see below), whose sum is σ = 123023679532. Its totient is φ = 122982342912.

The previous prime is 123003011203. The next prime is 123003011251. The reversal of 123003011221 is 122110300321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40274870596 + 82728140625 = 200686^2 + 287625^2 .

It is a cyclic number.

It is not a de Polignac number, because 123003011221 - 2⁵ = 123003011189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123003011195 and 123003011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123003011251) 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, 10325226 + ... + 10337131.

It is an arithmetic number, because the mean of its divisors is an integer number (30755919883).

Almost surely, 2^123003011221 is an apocalyptic number.

It is an amenable number.

123003011221 is a deficient number, since it is larger than the sum of its proper divisors (20668311).

123003011221 is an equidigital number, since it uses as much as digits as its factorization.

123003011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20668310.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 123003011221 its reverse (122110300321), we get a palindrome (245113311542).

The spelling of 123003011221 in words is "one hundred twenty-three billion, three million, eleven thousand, two hundred twenty-one".