20212121010111 has 32 divisors (see below), whose sum is σ = 27048502702080. Its totient is φ = 13425365602944.

The previous prime is 20212121010097. The next prime is 20212121010167. The reversal of 20212121010111 is 11101012121202.

It is a happy number.

It is not a de Polignac number, because 20212121010111 - 2¹¹ = 20212121008063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212121010811) 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 31 ways as a sum of consecutive naturals, for example, 1847706480 + ... + 1847717418.

It is an arithmetic number, because the mean of its divisors is an integer number (845265709440).

Almost surely, 2^{20212121010111} is an apocalyptic number.

20212121010111 is a deficient number, since it is larger than the sum of its proper divisors (6836381691969).

20212121010111 is a wasteful number, since it uses less digits than its factorization.

20212121010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13535.

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

Adding to 20212121010111 its reverse (11101012121202), we get a palindrome (31313133131313).

The spelling of 20212121010111 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, ten thousand, one hundred eleven".