2422121333221 has 4 divisors (see below), whose sum is σ = 2424337364812. Its totient is φ = 2419905301632.

The previous prime is 2422121333179. The next prime is 2422121333251. The reversal of 2422121333221 is 1223331212242.

It is a happy number.

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 1108048864321 + 1314072468900 = 1052639^2 + 1146330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2422121333221 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 2422121333221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2422121333251) 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, 1108014156 + ... + 1108016341.

It is an arithmetic number, because the mean of its divisors is an integer number (606084341203).

Almost surely, 2^{2422121333221} is an apocalyptic number.

It is an amenable number.

2422121333221 is a deficient number, since it is larger than the sum of its proper divisors (2216031591).

2422121333221 is a wasteful number, since it uses less digits than its factorization.

2422121333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216031590.

The product of its digits is 6912, while the sum is 28.

Adding to 2422121333221 its reverse (1223331212242), we get a palindrome (3645452545463).

The spelling of 2422121333221 in words is "two trillion, four hundred twenty-two billion, one hundred twenty-one million, three hundred thirty-three thousand, two hundred twenty-one".