21596903 has 2 divisors, whose sum is σ = 21596904. Its totient is φ = 21596902.

The previous prime is 21596857. The next prime is 21596921. The reversal of 21596903 is 30969512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21596903 - 2¹² = 21592807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21596983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10798451 + 10798452.

It is an arithmetic number, because the mean of its divisors is an integer number (10798452).

Almost surely, 2^21596903 is an apocalyptic number.

21596903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21596903 is an equidigital number, since it uses as much as digits as its factorization.

21596903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21596903 is about 4647.2468193544. The cubic root of 21596903 is about 278.4820191948.

The spelling of 21596903 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred three".