20202001022221 has 4 divisors (see below), whose sum is σ = 20202114547744. Its totient is φ = 20201887496700.

The previous prime is 20202001022153. The next prime is 20202001022297. The reversal of 20202001022221 is 12222010020202.

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 20202001022221 - 2¹⁵ = 20202000989453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202001022195 and 20202001022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202001022521) 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, 56495415 + ... + 56851876.

It is an arithmetic number, because the mean of its divisors is an integer number (5050528636936).

Almost surely, 2^{20202001022221} is an apocalyptic number.

It is an amenable number.

20202001022221 is a deficient number, since it is larger than the sum of its proper divisors (113525523).

20202001022221 is a wasteful number, since it uses less digits than its factorization.

20202001022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113525522.

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

Adding to 20202001022221 its reverse (12222010020202), we get a palindrome (32424011042423).

The spelling of 20202001022221 in words is "twenty trillion, two hundred two billion, one million, twenty-two thousand, two hundred twenty-one".