211221100030999 has 2 divisors, whose sum is σ = 211221100031000. Its totient is φ = 211221100030998.

The previous prime is 211221100030973. The next prime is 211221100031083. The reversal of 211221100030999 is 999030001122112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211221100030999 - 2²³ = 211221091642391 is a prime.

It is a super-2 number, since 2×211221100030999² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221100030939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610550015499 + 105610550015500.

It is an arithmetic number, because the mean of its divisors is an integer number (105610550015500).

Almost surely, 2^{211221100030999} is an apocalyptic number.

211221100030999 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221100030999 is an equidigital number, since it uses as much as digits as its factorization.

211221100030999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 40.

The spelling of 211221100030999 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred million, thirty thousand, nine hundred ninety-nine".