211420330021 has 2 divisors, whose sum is σ = 211420330022. Its totient is φ = 211420330020.

The previous prime is 211420329973. The next prime is 211420330031. The reversal of 211420330021 is 120033024112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123264188100 + 88156141921 = 351090^2 + 296911^2 .

It is a cyclic number.

It is not a de Polignac number, because 211420330021 - 2¹³ = 211420321829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211420330031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105710165010 + 105710165011.

It is an arithmetic number, because the mean of its divisors is an integer number (105710165011).

Almost surely, 2^211420330021 is an apocalyptic number.

It is an amenable number.

211420330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211420330021 is an equidigital number, since it uses as much as digits as its factorization.

211420330021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 211420330021 its reverse (120033024112), we get a palindrome (331453354133).

The spelling of 211420330021 in words is "two hundred eleven billion, four hundred twenty million, three hundred thirty thousand, twenty-one".