21171133611337 has 4 divisors (see below), whose sum is σ = 21172321217296. Its totient is φ = 21169946005380.

The previous prime is 21171133611319. The next prime is 21171133611347. The reversal of 21171133611337 is 73311633117112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21171133611337 - 2¹¹ = 21171133609289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21171133611337.

It is not an unprimeable number, because it can be changed into a prime (21171133611347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593776239 + ... + 593811892.

It is an arithmetic number, because the mean of its divisors is an integer number (5293080304324).

Almost surely, 2^{21171133611337} is an apocalyptic number.

It is an amenable number.

21171133611337 is a deficient number, since it is larger than the sum of its proper divisors (1187605959).

21171133611337 is a wasteful number, since it uses less digits than its factorization.

21171133611337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187605958.

The product of its digits is 47628, while the sum is 40.

Adding to 21171133611337 its reverse (73311633117112), we get a palindrome (94482766728449).

The spelling of 21171133611337 in words is "twenty-one trillion, one hundred seventy-one billion, one hundred thirty-three million, six hundred eleven thousand, three hundred thirty-seven".