21100010999 has 2 divisors, whose sum is σ = 21100011000. Its totient is φ = 21100010998.

The previous prime is 21100010983. The next prime is 21100011001. The reversal of 21100010999 is 99901000112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100010999 - 2⁴ = 21100010983 is a prime.

Together with 21100011001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100010969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550005499 + 10550005500.

It is an arithmetic number, because the mean of its divisors is an integer number (10550005500).

Almost surely, 2^21100010999 is an apocalyptic number.

21100010999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100010999 is an equidigital number, since it uses as much as digits as its factorization.

21100010999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 32.

The spelling of 21100010999 in words is "twenty-one billion, one hundred million, ten thousand, nine hundred ninety-nine".