20012021221211 has 4 divisors (see below), whose sum is σ = 20012434323000. Its totient is φ = 20011608119424.

The previous prime is 20012021221177. The next prime is 20012021221261. The reversal of 20012021221211 is 11212212021002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012021221211 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 20012021221211.

It is not an unprimeable number, because it can be changed into a prime (20012021221261) 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, 206478221 + ... + 206575118.

It is an arithmetic number, because the mean of its divisors is an integer number (5003108580750).

Almost surely, 2^{20012021221211} is an apocalyptic number.

20012021221211 is a deficient number, since it is larger than the sum of its proper divisors (413101789).

20012021221211 is an equidigital number, since it uses as much as digits as its factorization.

20012021221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413101788.

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

Adding to 20012021221211 its reverse (11212212021002), we get a palindrome (31224233242213).

The spelling of 20012021221211 in words is "twenty trillion, twelve billion, twenty-one million, two hundred twenty-one thousand, two hundred eleven".