20021101211211 has 16 divisors (see below), whose sum is σ = 27876436583424. Its totient is φ = 12757457965824.

The previous prime is 20021101211191. The next prime is 20021101211249. The reversal of 20021101211211 is 11211210112002.

It is a happy number.

It is not a de Polignac number, because 20021101211211 - 2⁶ = 20021101211147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021101211291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109238086 + ... + 109421211.

It is an arithmetic number, because the mean of its divisors is an integer number (1742277286464).

Almost surely, 2^{20021101211211} is an apocalyptic number.

20021101211211 is a deficient number, since it is larger than the sum of its proper divisors (7855335372213).

20021101211211 is a wasteful number, since it uses less digits than its factorization.

20021101211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218660650.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20021101211211 its reverse (11211210112002), we get a palindrome (31232311323213).

The spelling of 20021101211211 in words is "twenty trillion, twenty-one billion, one hundred one million, two hundred eleven thousand, two hundred eleven".