21201020110999 has 2 divisors, whose sum is σ = 21201020111000. Its totient is φ = 21201020110998.

The previous prime is 21201020110997. The next prime is 21201020111039. The reversal of 21201020110999 is 99901102010212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201020110999 - 2¹ = 21201020110997 is a prime.

Together with 21201020110997, 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 (21201020110993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600510055499 + 10600510055500.

It is an arithmetic number, because the mean of its divisors is an integer number (10600510055500).

Almost surely, 2^{21201020110999} is an apocalyptic number.

21201020110999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201020110999 is an equidigital number, since it uses as much as digits as its factorization.

21201020110999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 21201020110999 in words is "twenty-one trillion, two hundred one billion, twenty million, one hundred ten thousand, nine hundred ninety-nine".