21596953337 has 4 divisors (see below), whose sum is σ = 21602188020. Its totient is φ = 21591718656.

The previous prime is 21596953327. The next prime is 21596953349. The reversal of 21596953337 is 73335969512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12253604416 + 9343348921 = 110696^2 + 96661^2 .

It is a cyclic number.

It is not a de Polignac number, because 21596953337 - 2¹⁰ = 21596952313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21596953327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2611148 + ... + 2619405.

It is an arithmetic number, because the mean of its divisors is an integer number (5400547005).

Almost surely, 2^21596953337 is an apocalyptic number.

It is an amenable number.

21596953337 is a deficient number, since it is larger than the sum of its proper divisors (5234683).

21596953337 is an equidigital number, since it uses as much as digits as its factorization.

21596953337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234682.

The product of its digits is 4592700, while the sum is 53.

The spelling of 21596953337 in words is "twenty-one billion, five hundred ninety-six million, nine hundred fifty-three thousand, three hundred thirty-seven".