2102020211021 has 4 divisors (see below), whose sum is σ = 2102026397472. Its totient is φ = 2102014024572.

The previous prime is 2102020211017. The next prime is 2102020211063. The reversal of 2102020211021 is 1201120202012.

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 2102020211021 - 2² = 2102020211017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102020210987 and 2102020211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102020241021) 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, 2551991 + ... + 3273636.

It is an arithmetic number, because the mean of its divisors is an integer number (525506599368).

Almost surely, 2^{2102020211021} is an apocalyptic number.

It is an amenable number.

2102020211021 is a deficient number, since it is larger than the sum of its proper divisors (6186451).

2102020211021 is an equidigital number, since it uses as much as digits as its factorization.

2102020211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6186450.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2102020211021 its reverse (1201120202012), we get a palindrome (3303140413033).

Subtracting from 2102020211021 its reverse (1201120202012), we obtain a palindrome (900900009009).

The spelling of 2102020211021 in words is "two trillion, one hundred two billion, twenty million, two hundred eleven thousand, twenty-one".