20012202201221 has 4 divisors (see below), whose sum is σ = 20012212225152. Its totient is φ = 20012192177292.

The previous prime is 20012202201193. The next prime is 20012202201247. The reversal of 20012202201221 is 12210220221002.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20012202201221 - 2¹⁸ = 20012201939077 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 20012202201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012202203221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884015 + ... + 6387948.

It is an arithmetic number, because the mean of its divisors is an integer number (5003053056288).

Almost surely, 2^{20012202201221} is an apocalyptic number.

It is an amenable number.

20012202201221 is a deficient number, since it is larger than the sum of its proper divisors (10023931).

20012202201221 is an equidigital number, since it uses as much as digits as its factorization.

20012202201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10023930.

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

Adding to 20012202201221 its reverse (12210220221002), we get a palindrome (32222422422223).

The spelling of 20012202201221 in words is "twenty trillion, twelve billion, two hundred two million, two hundred one thousand, two hundred twenty-one".