21022100999 has 2 divisors, whose sum is σ = 21022101000. Its totient is φ = 21022100998.

The previous prime is 21022100989. The next prime is 21022101017. The reversal of 21022100999 is 99900122012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022100999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022100989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511050499 + 10511050500.

It is an arithmetic number, because the mean of its divisors is an integer number (10511050500).

Almost surely, 2^21022100999 is an apocalyptic number.

21022100999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022100999 is an equidigital number, since it uses as much as digits as its factorization.

21022100999 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 35.

The spelling of 21022100999 in words is "twenty-one billion, twenty-two million, one hundred thousand, nine hundred ninety-nine".