21019704611 has 2 divisors, whose sum is σ = 21019704612. Its totient is φ = 21019704610.

The previous prime is 21019704533. The next prime is 21019704613. The reversal of 21019704611 is 11640791012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21019704611 - 2¹⁰ = 21019703587 is a prime.

It is a super-2 number, since 2×21019704611² (a number of 21 digits) contains 22 as substring.

Together with 21019704613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21019704613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509852305 + 10509852306.

It is an arithmetic number, because the mean of its divisors is an integer number (10509852306).

Almost surely, 2^21019704611 is an apocalyptic number.

21019704611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019704611 is an equidigital number, since it uses as much as digits as its factorization.

21019704611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 21019704611 in words is "twenty-one billion, nineteen million, seven hundred four thousand, six hundred eleven".