22021121200021 has 4 divisors (see below), whose sum is σ = 22022916949152. Its totient is φ = 22019325450892.

The previous prime is 22021121200009. The next prime is 22021121200061. The reversal of 22021121200021 is 12000212112022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22021121200021 - 2⁷ = 22021121199893 is a prime.

It is a super-3 number, since 3×22021121200021³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021121199968 and 22021121200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021121200061) 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, 897856171 + ... + 897880696.

It is an arithmetic number, because the mean of its divisors is an integer number (5505729237288).

Almost surely, 2^{22021121200021} is an apocalyptic number.

It is an amenable number.

22021121200021 is a deficient number, since it is larger than the sum of its proper divisors (1795749131).

22021121200021 is a wasteful number, since it uses less digits than its factorization.

22021121200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795749130.

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

Adding to 22021121200021 its reverse (12000212112022), we get a palindrome (34021333312043).

The spelling of 22021121200021 in words is "twenty-two trillion, twenty-one billion, one hundred twenty-one million, two hundred thousand, twenty-one".