2101112021 has 4 divisors (see below), whose sum is σ = 2110534272. Its totient is φ = 2091689772.

The previous prime is 2101111993. The next prime is 2101112023. The reversal of 2101112021 is 1202111012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101112021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101111993 and 2101112011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101112023) 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 3 ways as a sum of consecutive naturals, for example, 4710791 + ... + 4711236.

It is an arithmetic number, because the mean of its divisors is an integer number (527633568).

Almost surely, 2^2101112021 is an apocalyptic number.

It is an amenable number.

2101112021 is a deficient number, since it is larger than the sum of its proper divisors (9422251).

2101112021 is an equidigital number, since it uses as much as digits as its factorization.

2101112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9422250.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2101112021 is about 45837.8884875820. Note that the first 3 decimals coincide. The cubic root of 2101112021 is about 1280.8051617558.

Adding to 2101112021 its reverse (1202111012), we get a palindrome (3303223033).

The spelling of 2101112021 in words is "two billion, one hundred one million, one hundred twelve thousand, twenty-one".