21111010099919 has 2 divisors, whose sum is σ = 21111010099920. Its totient is φ = 21111010099918.

The previous prime is 21111010099909. The next prime is 21111010100029. The reversal of 21111010099919 is 91999001011112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111010099919 - 2⁴ = 21111010099903 is a prime.

It is a super-2 number, since 2×21111010099919² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21111010099919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111010099909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555505049959 + 10555505049960.

It is an arithmetic number, because the mean of its divisors is an integer number (10555505049960).

Almost surely, 2^{21111010099919} is an apocalyptic number.

21111010099919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111010099919 is an equidigital number, since it uses as much as digits as its factorization.

21111010099919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 44.

The spelling of 21111010099919 in words is "twenty-one trillion, one hundred eleven billion, ten million, ninety-nine thousand, nine hundred nineteen".