2021100011111 has 4 divisors (see below), whose sum is σ = 2021733389424. Its totient is φ = 2020466632800.

The previous prime is 2021100011101. The next prime is 2021100011131. The reversal of 2021100011111 is 1111100011202.

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

It is a cyclic number.

It is not a de Polignac number, because 2021100011111 - 2²² = 2021095816807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021100011092 and 2021100011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021100011101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316684370 + ... + 316690751.

It is an arithmetic number, because the mean of its divisors is an integer number (505433347356).

Almost surely, 2^{2021100011111} is an apocalyptic number.

2021100011111 is a deficient number, since it is larger than the sum of its proper divisors (633378313).

2021100011111 is an equidigital number, since it uses as much as digits as its factorization.

2021100011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633378312.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 2021100011111 its reverse (1111100011202), we get a palindrome (3132200022313).

Subtracting from 2021100011111 its reverse (1111100011202), we obtain a palindrome (909999999909).

The spelling of 2021100011111 in words is "two trillion, twenty-one billion, one hundred million, eleven thousand, one hundred eleven".