2021100021111 has 16 divisors (see below), whose sum is σ = 2702783888000. Its totient is φ = 1343408835168.

The previous prime is 2021100021077. The next prime is 2021100021121. The reversal of 2021100021111 is 1111200011202.

It is not a de Polignac number, because 2021100021111 - 2¹⁰ = 2021100020087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021100021121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11364900 + ... + 11541366.

It is an arithmetic number, because the mean of its divisors is an integer number (168923993000).

Almost surely, 2^{2021100021111} is an apocalyptic number.

2021100021111 is a deficient number, since it is larger than the sum of its proper divisors (681683866889).

2021100021111 is a wasteful number, since it uses less digits than its factorization.

2021100021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187758.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2021100021111 its reverse (1111200011202), we get a palindrome (3132300032313).

Subtracting from 2021100021111 its reverse (1111200011202), we obtain a palindrome (909900009909).

The spelling of 2021100021111 in words is "two trillion, twenty-one billion, one hundred million, twenty-one thousand, one hundred eleven".