21104349 has 12 divisors (see below), whose sum is σ = 32733504. Its totient is φ = 12059544.

The previous prime is 21104341. The next prime is 21104389. The reversal of 21104349 is 94340112.

It is not a de Polignac number, because 21104349 - 2³ = 21104341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71637 + ... + 71930.

It is an arithmetic number, because the mean of its divisors is an integer number (2727792).

Almost surely, 2^21104349 is an apocalyptic number.

It is an amenable number.

21104349 is a deficient number, since it is larger than the sum of its proper divisors (11629155).

21104349 is a wasteful number, since it uses less digits than its factorization.

21104349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143584 (or 143577 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21104349 is about 4593.9469957761. The cubic root of 21104349 is about 276.3486326341.

The spelling of 21104349 in words is "twenty-one million, one hundred four thousand, three hundred forty-nine".