21596001 has 16 divisors (see below), whose sum is σ = 34844544. Its totient is φ = 11614464.

The previous prime is 21595997. The next prime is 21596021. The reversal of 21596001 is 10069512.

It is not a de Polignac number, because 21596001 - 2² = 21595997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21596021) 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 15 ways as a sum of consecutive naturals, for example, 29890 + ... + 30603.

It is an arithmetic number, because the mean of its divisors is an integer number (2177784).

Almost surely, 2^21596001 is an apocalyptic number.

21596001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21596001 is a deficient number, since it is larger than the sum of its proper divisors (13248543).

21596001 is a wasteful number, since it uses less digits than its factorization.

21596001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60520.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 21596001 is about 4647.1497716342. The cubic root of 21596001 is about 278.4781421840.

The spelling of 21596001 in words is "twenty-one million, five hundred ninety-six thousand, one".