21102719699 has 2 divisors, whose sum is σ = 21102719700. Its totient is φ = 21102719698.

The previous prime is 21102719657. The next prime is 21102719723. The reversal of 21102719699 is 99691720112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102719699 - 2¹⁶ = 21102654163 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21102719299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551359849 + 10551359850.

It is an arithmetic number, because the mean of its divisors is an integer number (10551359850).

Almost surely, 2^21102719699 is an apocalyptic number.

21102719699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102719699 is an equidigital number, since it uses as much as digits as its factorization.

21102719699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 47.

The spelling of 21102719699 in words is "twenty-one billion, one hundred two million, seven hundred nineteen thousand, six hundred ninety-nine".