211101022021 has 2 divisors, whose sum is σ = 211101022022. Its totient is φ = 211101022020.

The previous prime is 211101022019. The next prime is 211101022039. The reversal of 211101022021 is 120220101112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210645199521 + 455822500 = 458961^2 + 21350^2 .

It is a cyclic number.

It is not a de Polignac number, because 211101022021 - 2¹ = 211101022019 is a prime.

Together with 211101022019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 211101021992 and 211101022010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211101022721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105550511010 + 105550511011.

It is an arithmetic number, because the mean of its divisors is an integer number (105550511011).

Almost surely, 2^211101022021 is an apocalyptic number.

It is an amenable number.

211101022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211101022021 is an equidigital number, since it uses as much as digits as its factorization.

211101022021 is an evil number, because the sum of its binary digits is even.

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

Adding to 211101022021 its reverse (120220101112), we get a palindrome (331321123133).

The spelling of 211101022021 in words is "two hundred eleven billion, one hundred one million, twenty-two thousand, twenty-one".