20122021220221 has 4 divisors (see below), whose sum is σ = 20122032840444. Its totient is φ = 20122009600000.

The previous prime is 20122021220183. The next prime is 20122021220267. The reversal of 20122021220221 is 12202212022102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18964544328900 + 1157476891321 = 4354830^2 + 1075861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122021220221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122021220291) 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, 2633860 + ... + 6868861.

It is an arithmetic number, because the mean of its divisors is an integer number (5030508210111).

Almost surely, 2^{20122021220221} is an apocalyptic number.

It is an amenable number.

20122021220221 is a deficient number, since it is larger than the sum of its proper divisors (11620223).

20122021220221 is an equidigital number, since it uses as much as digits as its factorization.

20122021220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11620222.

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

Adding to 20122021220221 its reverse (12202212022102), we get a palindrome (32324233242323).

The spelling of 20122021220221 in words is "twenty trillion, one hundred twenty-two billion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".