20201022221 has 4 divisors (see below), whose sum is σ = 20401032444. Its totient is φ = 20001012000.

The previous prime is 20201022203. The next prime is 20201022271. The reversal of 20201022221 is 12222010202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14127937321 + 6073084900 = 118861^2 + 77930^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201022221 - 2²⁶ = 20133913357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201022196 and 20201022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201022271) 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, 100004960 + ... + 100005161.

It is an arithmetic number, because the mean of its divisors is an integer number (5100258111).

Almost surely, 2^20201022221 is an apocalyptic number.

It is an amenable number.

20201022221 is a deficient number, since it is larger than the sum of its proper divisors (200010223).

20201022221 is a wasteful number, since it uses less digits than its factorization.

20201022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200010222.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20201022221 its reverse (12222010202), we get a palindrome (32423032423).

The spelling of 20201022221 in words is "twenty billion, two hundred one million, twenty-two thousand, two hundred twenty-one".