21791004521349 has 32 divisors (see below), whose sum is σ = 33289892823040. Its totient is φ = 12420301525632.

The previous prime is 21791004521327. The next prime is 21791004521381. The reversal of 21791004521349 is 94312540019712.

It is not a de Polignac number, because 21791004521349 - 2¹⁷ = 21791004390277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21791004521298 and 21791004521307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21791004521309) 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 31 ways as a sum of consecutive naturals, for example, 88369344 + ... + 88615590.

It is an arithmetic number, because the mean of its divisors is an integer number (1040309150720).

Almost surely, 2^{21791004521349} is an apocalyptic number.

It is an amenable number.

21791004521349 is a deficient number, since it is larger than the sum of its proper divisors (11498888301691).

21791004521349 is a wasteful number, since it uses less digits than its factorization.

21791004521349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256969.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 21791004521349 in words is "twenty-one trillion, seven hundred ninety-one billion, four million, five hundred twenty-one thousand, three hundred forty-nine".