22221200121 has 16 divisors (see below), whose sum is σ = 29924843520. Its totient is φ = 14665931280.

The previous prime is 22221200081. The next prime is 22221200129. The reversal of 22221200121 is 12100212222.

It is not a de Polignac number, because 22221200121 - 2¹¹ = 22221198073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22221200121.

It is not an unprimeable number, because it can be changed into a prime (22221200129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1276486 + ... + 1293776.

It is an arithmetic number, because the mean of its divisors is an integer number (1870302720).

Almost surely, 2^22221200121 is an apocalyptic number.

It is an amenable number.

22221200121 is a deficient number, since it is larger than the sum of its proper divisors (7703643399).

22221200121 is a wasteful number, since it uses less digits than its factorization.

22221200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21556.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22221200121 its reverse (12100212222), we get a palindrome (34321412343).

The spelling of 22221200121 in words is "twenty-two billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".