2222121200021 has 4 divisors (see below), whose sum is σ = 2239618217472. Its totient is φ = 2204624182572.

The previous prime is 2222121199981. The next prime is 2222121200027. The reversal of 2222121200021 is 1200021212222.

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 2222121200021 - 2²⁶ = 2222054091157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222121200027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8748508535 + ... + 8748508788.

It is an arithmetic number, because the mean of its divisors is an integer number (559904554368).

Almost surely, 2^{2222121200021} is an apocalyptic number.

It is an amenable number.

2222121200021 is a deficient number, since it is larger than the sum of its proper divisors (17497017451).

2222121200021 is a wasteful number, since it uses less digits than its factorization.

2222121200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17497017450.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2222121200021 its reverse (1200021212222), we get a palindrome (3422142412243).

The spelling of 2222121200021 in words is "two trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred thousand, twenty-one".