22121330333221 has 32 divisors (see below), whose sum is σ = 26594372494080. Its totient is φ = 17998833484800.

The previous prime is 22121330333213. The next prime is 22121330333227. The reversal of 22121330333221 is 12233303312122.

It is a happy number.

It is not a de Polignac number, because 22121330333221 - 2³ = 22121330333213 is a prime.

It is a super-2 number, since 2×22121330333221² (a number of 27 digits) contains 22 as substring.

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 22121330333221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121330333227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26346330 + ... + 27172996.

It is an arithmetic number, because the mean of its divisors is an integer number (831074140440).

Almost surely, 2^{22121330333221} is an apocalyptic number.

It is an amenable number.

22121330333221 is a deficient number, since it is larger than the sum of its proper divisors (4473042160859).

22121330333221 is a wasteful number, since it uses less digits than its factorization.

22121330333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828925.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 22121330333221 its reverse (12233303312122), we get a palindrome (34354633645343).

The spelling of 22121330333221 in words is "twenty-two trillion, one hundred twenty-one billion, three hundred thirty million, three hundred thirty-three thousand, two hundred twenty-one".