211142320021 has 2 divisors, whose sum is σ = 211142320022. Its totient is φ = 211142320020.

The previous prime is 211142320019. The next prime is 211142320057. The reversal of 211142320021 is 120023241112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109371749796 + 101770570225 = 330714^2 + 319015^2 .

It is a cyclic number.

It is not a de Polignac number, because 211142320021 - 2¹ = 211142320019 is a prime.

Together with 211142320019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211142320001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105571160010 + 105571160011.

It is an arithmetic number, because the mean of its divisors is an integer number (105571160011).

Almost surely, 2^211142320021 is an apocalyptic number.

It is an amenable number.

211142320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211142320021 is an equidigital number, since it uses as much as digits as its factorization.

211142320021 is an evil number, because the sum of its binary digits is even.

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

Adding to 211142320021 its reverse (120023241112), we get a palindrome (331165561133).

The spelling of 211142320021 in words is "two hundred eleven billion, one hundred forty-two million, three hundred twenty thousand, twenty-one".