20021021011711 has 2 divisors, whose sum is σ = 20021021011712. Its totient is φ = 20021021011710.

The previous prime is 20021021011703. The next prime is 20021021011721. The reversal of 20021021011711 is 11711012012002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021021011711 - 2³ = 20021021011703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021021011721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510505855 + 10010510505856.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510505856).

Almost surely, 2^{20021021011711} is an apocalyptic number.

20021021011711 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021021011711 is an equidigital number, since it uses as much as digits as its factorization.

20021021011711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 20021021011711 its reverse (11711012012002), we get a palindrome (31732033023713).

The spelling of 20021021011711 in words is "twenty trillion, twenty-one billion, twenty-one million, eleven thousand, seven hundred eleven".