21021019711 has 2 divisors, whose sum is σ = 21021019712. Its totient is φ = 21021019710.

The previous prime is 21021019709. The next prime is 21021019729. The reversal of 21021019711 is 11791012012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021019711 - 2¹ = 21021019709 is a prime.

Together with 21021019709, 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 (21021019111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510509855 + 10510509856.

It is an arithmetic number, because the mean of its divisors is an integer number (10510509856).

Almost surely, 2^21021019711 is an apocalyptic number.

21021019711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021019711 is an equidigital number, since it uses as much as digits as its factorization.

21021019711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 25.

The spelling of 21021019711 in words is "twenty-one billion, twenty-one million, nineteen thousand, seven hundred eleven".