221312332122121 has 8 divisors (see below), whose sum is σ = 230222807452800. Its totient is φ = 212487124498320.

The previous prime is 221312332122103. The next prime is 221312332122227. The reversal of 221312332122121 is 121221233213122.

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

It is not a de Polignac number, because 221312332122121 - 2¹¹ = 221312332120073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221312332122121.

It is not an unprimeable number, because it can be changed into a prime (221312332129121) 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, 21316921425 + ... + 21316931806.

It is an arithmetic number, because the mean of its divisors is an integer number (28777850931600).

Almost surely, 2^{221312332122121} is an apocalyptic number.

It is an amenable number.

221312332122121 is a deficient number, since it is larger than the sum of its proper divisors (8910475330679).

221312332122121 is a wasteful number, since it uses less digits than its factorization.

221312332122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42633853439.

The product of its digits is 3456, while the sum is 28.

Adding to 221312332122121 its reverse (121221233213122), we get a palindrome (342533565335243).

The spelling of 221312332122121 in words is "two hundred twenty-one trillion, three hundred twelve billion, three hundred thirty-two million, one hundred twenty-two thousand, one hundred twenty-one".