21320110511999 has 24 divisors (see below), whose sum is σ = 23712032422512. Its totient is φ = 19146749207040.

The previous prime is 21320110511983. The next prime is 21320110512013. The reversal of 21320110511999 is 99911501102312.

It is not a de Polignac number, because 21320110511999 - 2⁴ = 21320110511983 is a prime.

It is a super-2 number, since 2×21320110511999² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320110511099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86624984 + ... + 86870754.

It is an arithmetic number, because the mean of its divisors is an integer number (988001350938).

Almost surely, 2^{21320110511999} is an apocalyptic number.

21320110511999 is a deficient number, since it is larger than the sum of its proper divisors (2391921910513).

21320110511999 is a wasteful number, since it uses less digits than its factorization.

21320110511999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259707 (or 259694 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 44.

The spelling of 21320110511999 in words is "twenty-one trillion, three hundred twenty billion, one hundred ten million, five hundred eleven thousand, nine hundred ninety-nine".