21596449 has 16 divisors (see below), whose sum is σ = 25472128. Its totient is φ = 17926272.

The previous prime is 21596437. The next prime is 21596461. The reversal of 21596449 is 94469512.

It is an interprime number because it is at equal distance from previous prime (21596437) and next prime (21596461).

It is not a de Polignac number, because 21596449 - 2⁵ = 21596417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21596479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47029 + ... + 47485.

It is an arithmetic number, because the mean of its divisors is an integer number (1592008).

Almost surely, 2^21596449 is an apocalyptic number.

It is an amenable number.

21596449 is a deficient number, since it is larger than the sum of its proper divisors (3875679).

21596449 is a wasteful number, since it uses less digits than its factorization.

21596449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664.

The product of its digits is 77760, while the sum is 40.

The square root of 21596449 is about 4647.1979729725. The cubic root of 21596449 is about 278.4800678082.

The spelling of 21596449 in words is "twenty-one million, five hundred ninety-six thousand, four hundred forty-nine".