22120121221 has 16 divisors (see below), whose sum is σ = 24514311168. Its totient is φ = 19790377200.

The previous prime is 22120121159. The next prime is 22120121237. The reversal of 22120121221 is 12212102122.

It is a happy number.

It is not a de Polignac number, because 22120121221 - 2⁹ = 22120120709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22120121195 and 22120121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120121281) 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, 799306 + ... + 826516.

It is an arithmetic number, because the mean of its divisors is an integer number (1532144448).

Almost surely, 2^22120121221 is an apocalyptic number.

It is an amenable number.

22120121221 is a deficient number, since it is larger than the sum of its proper divisors (2394189947).

22120121221 is a wasteful number, since it uses less digits than its factorization.

22120121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28392.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22120121221 its reverse (12212102122), we get a palindrome (34332223343).

It can be divided in two parts, 22120 and 121221, that added together give a palindrome (143341).

The spelling of 22120121221 in words is "twenty-two billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".