21102120011699 has 2 divisors, whose sum is σ = 21102120011700. Its totient is φ = 21102120011698.

The previous prime is 21102120011689. The next prime is 21102120011701. The reversal of 21102120011699 is 99611002120112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102120011699 - 2⁸ = 21102120011443 is a prime.

Together with 21102120011701, 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 (21102120011689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551060005849 + 10551060005850.

It is an arithmetic number, because the mean of its divisors is an integer number (10551060005850).

Almost surely, 2^{21102120011699} is an apocalyptic number.

21102120011699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102120011699 is an equidigital number, since it uses as much as digits as its factorization.

21102120011699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The spelling of 21102120011699 in words is "twenty-one trillion, one hundred two billion, one hundred twenty million, eleven thousand, six hundred ninety-nine".