20022101211221 has 4 divisors (see below), whose sum is σ = 20510445143244. Its totient is φ = 19533757279200.

The previous prime is 20022101211197. The next prime is 20022101211271. The reversal of 20022101211221 is 12211210122002.

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 1008236892100 + 19013864319121 = 1004110^2 + 4360489^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022101211221 - 2³⁴ = 20004921342037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20022101211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022101211271) 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, 244171965950 + ... + 244171966031.

It is an arithmetic number, because the mean of its divisors is an integer number (5127611285811).

Almost surely, 2^{20022101211221} is an apocalyptic number.

It is an amenable number.

20022101211221 is a deficient number, since it is larger than the sum of its proper divisors (488343932023).

20022101211221 is an equidigital number, since it uses as much as digits as its factorization.

20022101211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488343932022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20022101211221 its reverse (12211210122002), we get a palindrome (32233311333223).

The spelling of 20022101211221 in words is "twenty trillion, twenty-two billion, one hundred one million, two hundred eleven thousand, two hundred twenty-one".