2121233120221 has 8 divisors (see below), whose sum is σ = 2142278719488. Its totient is φ = 2100188370000.

The previous prime is 2121233120191. The next prime is 2121233120233. The reversal of 2121233120221 is 1220213321212.

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 2121233120221 - 2²¹ = 2121231023069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121233120192 and 2121233120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121233120021) 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, 5592676 + ... + 5959906.

It is an arithmetic number, because the mean of its divisors is an integer number (267784839936).

Almost surely, 2^{2121233120221} is an apocalyptic number.

It is an amenable number.

2121233120221 is a deficient number, since it is larger than the sum of its proper divisors (21045599267).

2121233120221 is a wasteful number, since it uses less digits than its factorization.

2121233120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424523.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2121233120221 its reverse (1220213321212), we get a palindrome (3341446441433).

The spelling of 2121233120221 in words is "two trillion, one hundred twenty-one billion, two hundred thirty-three million, one hundred twenty thousand, two hundred twenty-one".