2101111101021 has 4 divisors (see below), whose sum is σ = 2801481468032. Its totient is φ = 1400740734012.

The previous prime is 2101111100951. The next prime is 2101111101031. The reversal of 2101111101021 is 1201011111012.

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 not a de Polignac number, because 2101111101021 - 2¹⁴ = 2101111084637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2101111100988 and 2101111101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101111101031) 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, 350185183501 + ... + 350185183506.

It is an arithmetic number, because the mean of its divisors is an integer number (700370367008).

Almost surely, 2^{2101111101021} is an apocalyptic number.

It is an amenable number.

2101111101021 is a deficient number, since it is larger than the sum of its proper divisors (700370367011).

2101111101021 is an equidigital number, since it uses as much as digits as its factorization.

2101111101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700370367010.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 2101111101021 its reverse (1201011111012), we get a palindrome (3302122212033).

Subtracting from 2101111101021 its reverse (1201011111012), we obtain a palindrome (900099990009).

The spelling of 2101111101021 in words is "two trillion, one hundred one billion, one hundred eleven million, one hundred one thousand, twenty-one".