22120121220021 has 24 divisors (see below), whose sum is σ = 34868768413440. Its totient is φ = 13401203371200.

The previous prime is 22120121220019. The next prime is 22120121220083. The reversal of 22120121220021 is 12002212102122.

It is a happy number.

22120121220021 is a `hidden beast` number, since 221 + 201 + 2 + 1 + 220 + 0 + 21 = 666.

It is not a de Polignac number, because 22120121220021 - 2¹ = 22120121220019 is a prime.

It is a super-3 number, since 3×22120121220021³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22120121219976 and 22120121220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22120121220091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40818640 + ... + 41357001.

It is an arithmetic number, because the mean of its divisors is an integer number (1452865350560).

Almost surely, 2^{22120121220021} is an apocalyptic number.

It is an amenable number.

22120121220021 is a deficient number, since it is larger than the sum of its proper divisors (12748647193419).

22120121220021 is a wasteful number, since it uses less digits than its factorization.

22120121220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82178377 (or 82178374 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22120121220021 its reverse (12002212102122), we get a palindrome (34122333322143).

The spelling of 22120121220021 in words is "twenty-two trillion, one hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, twenty-one".