20202012102221 has 4 divisors (see below), whose sum is σ = 20263045371744. Its totient is φ = 20140978832700.

The previous prime is 20202012102199. The next prime is 20202012102247. The reversal of 20202012102221 is 12220121020202.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-20202012102221 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 20202012102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202012102121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30516634265 + ... + 30516634926.

It is an arithmetic number, because the mean of its divisors is an integer number (5065761342936).

Almost surely, 2^{20202012102221} is an apocalyptic number.

It is an amenable number.

20202012102221 is a deficient number, since it is larger than the sum of its proper divisors (61033269523).

20202012102221 is an equidigital number, since it uses as much as digits as its factorization.

20202012102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61033269522.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20202012102221 its reverse (12220121020202), we get a palindrome (32422133122423).

The spelling of 20202012102221 in words is "twenty trillion, two hundred two billion, twelve million, one hundred two thousand, two hundred twenty-one".