123221122121221 has 8 divisors (see below), whose sum is σ = 128629565273664. Its totient is φ = 117816929223840.

The previous prime is 123221122121203. The next prime is 123221122121231. The reversal of 123221122121221 is 122121221122321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123221122121221 - 2⁴¹ = 121022098865669 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 (123221122121231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1062504511 + ... + 1062620476.

It is an arithmetic number, because the mean of its divisors is an integer number (16078695659208).

Almost surely, 2^{123221122121221} is an apocalyptic number.

It is an amenable number.

123221122121221 is a deficient number, since it is larger than the sum of its proper divisors (5408443152443).

123221122121221 is a wasteful number, since it uses less digits than its factorization.

123221122121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125127531.

The product of its digits is 768, while the sum is 25.

Adding to 123221122121221 its reverse (122121221122321), we get a palindrome (245342343243542).

The spelling of 123221122121221 in words is "one hundred twenty-three trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".