2021222200021 has 4 divisors (see below), whose sum is σ = 2040112127232. Its totient is φ = 2002332272812.

The previous prime is 2021222199977. The next prime is 2021222200033. The reversal of 2021222200021 is 1200022221202.

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 2021222200021 - 2¹³ = 2021222191829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021222199968 and 2021222200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021222200121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9444963445 + ... + 9444963658.

It is an arithmetic number, because the mean of its divisors is an integer number (510028031808).

Almost surely, 2^{2021222200021} is an apocalyptic number.

It is an amenable number.

2021222200021 is a deficient number, since it is larger than the sum of its proper divisors (18889927211).

2021222200021 is a wasteful number, since it uses less digits than its factorization.

2021222200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18889927210.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 2021222200021 its reverse (1200022221202), we get a palindrome (3221244421223).

The spelling of 2021222200021 in words is "two trillion, twenty-one billion, two hundred twenty-two million, two hundred thousand, twenty-one".