211420231021 has 2 divisors, whose sum is σ = 211420231022. Its totient is φ = 211420231020.

The previous prime is 211420231019. The next prime is 211420231031. The reversal of 211420231021 is 120132024112.

211420231021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134605336996 + 76814894025 = 366886^2 + 277155^2 .

It is a cyclic number.

It is not a de Polignac number, because 211420231021 - 2¹ = 211420231019 is a prime.

Together with 211420231019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 211420231021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211420231031) 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 as a sum of consecutive naturals, namely, 105710115510 + 105710115511.

It is an arithmetic number, because the mean of its divisors is an integer number (105710115511).

Almost surely, 2^211420231021 is an apocalyptic number.

It is an amenable number.

211420231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211420231021 is an equidigital number, since it uses as much as digits as its factorization.

211420231021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 211420231021 its reverse (120132024112), we get a palindrome (331552255133).

The spelling of 211420231021 in words is "two hundred eleven billion, four hundred twenty million, two hundred thirty-one thousand, twenty-one".