20001122210221 has 4 divisors (see below), whose sum is σ = 20105840127744. Its totient is φ = 19896404292700.

The previous prime is 20001122210161. The next prime is 20001122210227. The reversal of 20001122210221 is 12201222110002.

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 20001122210221 - 2⁷ = 20001122210093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001122210195 and 20001122210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001122210227) 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, 52358958475 + ... + 52358958856.

It is an arithmetic number, because the mean of its divisors is an integer number (5026460031936).

Almost surely, 2^{20001122210221} is an apocalyptic number.

It is an amenable number.

20001122210221 is a deficient number, since it is larger than the sum of its proper divisors (104717917523).

20001122210221 is a wasteful number, since it uses less digits than its factorization.

20001122210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104717917522.

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

Adding to 20001122210221 its reverse (12201222110002), we get a palindrome (32202344320223).

The spelling of 20001122210221 in words is "twenty trillion, one billion, one hundred twenty-two million, two hundred ten thousand, two hundred twenty-one".