21611210373371 has 4 divisors (see below), whose sum is σ = 21616446919872. Its totient is φ = 21605973826872.

The previous prime is 21611210373329. The next prime is 21611210373397. The reversal of 21611210373371 is 17337301211612.

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

It is a cyclic number.

It is not a de Polignac number, because 21611210373371 - 2³⁰ = 21610136631547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21611210373871) 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, 2618267060 + ... + 2618275313.

It is an arithmetic number, because the mean of its divisors is an integer number (5404111729968).

Almost surely, 2^{21611210373371} is an apocalyptic number.

21611210373371 is a deficient number, since it is larger than the sum of its proper divisors (5236546501).

21611210373371 is an equidigital number, since it uses as much as digits as its factorization.

21611210373371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5236546500.

The product of its (nonzero) digits is 31752, while the sum is 38.

Adding to 21611210373371 its reverse (17337301211612), we get a palindrome (38948511584983).

The spelling of 21611210373371 in words is "twenty-one trillion, six hundred eleven billion, two hundred ten million, three hundred seventy-three thousand, three hundred seventy-one".