21346440191499 has 16 divisors (see below), whose sum is σ = 28663536011040. Its totient is φ = 14130280919040.

The previous prime is 21346440191407. The next prime is 21346440191513. The reversal of 21346440191499 is 99419104464312.

It is not a de Polignac number, because 21346440191499 - 2¹⁵ = 21346440158731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21346440291499) 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 in 15 ways as a sum of consecutive naturals, for example, 15419232 + ... + 16746509.

It is an arithmetic number, because the mean of its divisors is an integer number (1791471000690).

Almost surely, 2^{21346440191499} is an apocalyptic number.

21346440191499 is a deficient number, since it is larger than the sum of its proper divisors (7317095819541).

21346440191499 is a wasteful number, since it uses less digits than its factorization.

21346440191499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32167310.

The product of its (nonzero) digits is 6718464, while the sum is 57.

The spelling of 21346440191499 in words is "twenty-one trillion, three hundred forty-six billion, four hundred forty million, one hundred ninety-one thousand, four hundred ninety-nine".