20021022022221 has 24 divisors (see below), whose sum is σ = 31548581606880. Its totient is φ = 12133835632800.

The previous prime is 20021022022193. The next prime is 20021022022223. The reversal of 20021022022221 is 12222022012002.

20021022022221 is a `hidden beast` number, since 200 + 2 + 1 + 0 + 220 + 22 + 221 = 666.

It is not a de Polignac number, because 20021022022221 - 2⁷ = 20021022022093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021022022194 and 20021022022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021022022223) 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 23 ways as a sum of consecutive naturals, for example, 9948106 + ... + 11790116.

It is an arithmetic number, because the mean of its divisors is an integer number (1314524233620).

Almost surely, 2^{20021022022221} is an apocalyptic number.

It is an amenable number.

20021022022221 is a deficient number, since it is larger than the sum of its proper divisors (11527559584659).

20021022022221 is a wasteful number, since it uses less digits than its factorization.

20021022022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951817 (or 1951814 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20021022022221 its reverse (12222022012002), we get a palindrome (32243044034223).

The spelling of 20021022022221 in words is "twenty trillion, twenty-one billion, twenty-two million, twenty-two thousand, two hundred twenty-one".