20011222121201 has 4 divisors (see below), whose sum is σ = 20011231385712. Its totient is φ = 20011212856692.

The previous prime is 20011222121167. The next prime is 20011222121203. The reversal of 20011222121201 is 10212122211002.

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 20011222121201 - 2²² = 20011217926897 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 20011222121201.

It is not an unprimeable number, because it can be changed into a prime (20011222121203) 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, 512030 + ... + 6347016.

It is an arithmetic number, because the mean of its divisors is an integer number (5002807846428).

Almost surely, 2^{20011222121201} is an apocalyptic number.

It is an amenable number.

20011222121201 is a deficient number, since it is larger than the sum of its proper divisors (9264511).

20011222121201 is an equidigital number, since it uses as much as digits as its factorization.

20011222121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9264510.

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

Adding to 20011222121201 its reverse (10212122211002), we get a palindrome (30223344332203).

The spelling of 20011222121201 in words is "twenty trillion, eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred one".