2102020002221 has 4 divisors (see below), whose sum is σ = 2102022923712. Its totient is φ = 2102017080732.

The previous prime is 2102020002217. The next prime is 2102020002233. The reversal of 2102020002221 is 1222000202012.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2102020002221 - 2² = 2102020002217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102020002196 and 2102020002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102020002211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463070 + ... + 2102016.

It is an arithmetic number, because the mean of its divisors is an integer number (525505730928).

Almost surely, 2^{2102020002221} is an apocalyptic number.

It is an amenable number.

2102020002221 is a deficient number, since it is larger than the sum of its proper divisors (2921491).

2102020002221 is a wasteful number, since it uses less digits than its factorization.

2102020002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921490.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2102020002221 its reverse (1222000202012), we get a palindrome (3324020204233).

The spelling of 2102020002221 in words is "two trillion, one hundred two billion, twenty million, two thousand, two hundred twenty-one".