20021022221221 has 12 divisors (see below), whose sum is σ = 24041043143040. Its totient is φ = 16607299537080.

The previous prime is 20021022221201. The next prime is 20021022221227. The reversal of 20021022221221 is 12212222012002.

It is not a de Polignac number, because 20021022221221 - 2²³ = 20021013832613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021022221227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6590196711 + ... + 6590199748.

It is an arithmetic number, because the mean of its divisors is an integer number (2003420261920).

Almost surely, 2^{20021022221221} is an apocalyptic number.

It is an amenable number.

20021022221221 is a deficient number, since it is larger than the sum of its proper divisors (4020020921819).

20021022221221 is a wasteful number, since it uses less digits than its factorization.

20021022221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13180396504 (or 13180396497 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20021022221221 its reverse (12212222012002), we get a palindrome (32233244233223).

The spelling of 20021022221221 in words is "twenty trillion, twenty-one billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".