2100212011021 has 4 divisors (see below), whose sum is σ = 2100462432192. Its totient is φ = 2099961589852.

The previous prime is 2100212010961. The next prime is 2100212011043. The reversal of 2100212011021 is 1201102120012.

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 not a de Polignac number, because 2100212011021 - 2⁹ = 2100212010509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100212010992 and 2100212011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100212011061) 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, 125198005 + ... + 125214778.

It is an arithmetic number, because the mean of its divisors is an integer number (525115608048).

Almost surely, 2^{2100212011021} is an apocalyptic number.

It is an amenable number.

2100212011021 is a deficient number, since it is larger than the sum of its proper divisors (250421171).

2100212011021 is an equidigital number, since it uses as much as digits as its factorization.

2100212011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250421170.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100212011021 its reverse (1201102120012), we get a palindrome (3301314131033).

The spelling of 2100212011021 in words is "two trillion, one hundred billion, two hundred twelve million, eleven thousand, twenty-one".