211100002021 has 2 divisors, whose sum is σ = 211100002022. Its totient is φ = 211100002020.

The previous prime is 211100002019. The next prime is 211100002027. The reversal of 211100002021 is 120200001112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127527552100 + 83572449921 = 357110^2 + 289089^2 .

It is a cyclic number.

It is not a de Polignac number, because 211100002021 - 2¹ = 211100002019 is a prime.

Together with 211100002019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 211100001989 and 211100002007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211100002027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105550001010 + 105550001011.

It is an arithmetic number, because the mean of its divisors is an integer number (105550001011).

Almost surely, 2^211100002021 is an apocalyptic number.

It is an amenable number.

211100002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211100002021 is an equidigital number, since it uses as much as digits as its factorization.

211100002021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 211100002021 its reverse (120200001112), we get a palindrome (331300003133).

Subtracting from 211100002021 its reverse (120200001112), we obtain a palindrome (90900000909).

The spelling of 211100002021 in words is "two hundred eleven billion, one hundred million, two thousand, twenty-one".