21210643331711 has 2 divisors, whose sum is σ = 21210643331712. Its totient is φ = 21210643331710.

The previous prime is 21210643331653. The next prime is 21210643331803. The reversal of 21210643331711 is 11713334601212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210643331711 - 2¹⁰ = 21210643330687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210643337711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605321665855 + 10605321665856.

It is an arithmetic number, because the mean of its divisors is an integer number (10605321665856).

Almost surely, 2^{21210643331711} is an apocalyptic number.

21210643331711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210643331711 is an equidigital number, since it uses as much as digits as its factorization.

21210643331711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

Adding to 21210643331711 its reverse (11713334601212), we get a palindrome (32923977932923).

The spelling of 21210643331711 in words is "twenty-one trillion, two hundred ten billion, six hundred forty-three million, three hundred thirty-one thousand, seven hundred eleven".