20002022221 has 4 divisors (see below), whose sum is σ = 20002371552. Its totient is φ = 20001672892.

The previous prime is 20002022203. The next prime is 20002022267. The reversal of 20002022221 is 12222020002.

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 20002022221 - 2⁵ = 20002022189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002022281) 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, 66415 + ... + 210748.

It is an arithmetic number, because the mean of its divisors is an integer number (5000592888).

Almost surely, 2^20002022221 is an apocalyptic number.

It is an amenable number.

20002022221 is a deficient number, since it is larger than the sum of its proper divisors (349331).

20002022221 is an equidigital number, since it uses as much as digits as its factorization.

20002022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349330.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20002022221 its reverse (12222020002), we get a palindrome (32224042223).

The spelling of 20002022221 in words is "twenty billion, two million, twenty-two thousand, two hundred twenty-one".