21379810183 has 4 divisors (see below), whose sum is σ = 21383762400. Its totient is φ = 21375857968.

The previous prime is 21379810163. The next prime is 21379810187. The reversal of 21379810183 is 38101897312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21379810183 is a prime.

It is a super-2 number, since 2×21379810183² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379810187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1967983 + ... + 1978816.

It is an arithmetic number, because the mean of its divisors is an integer number (5345940600).

Almost surely, 2^21379810183 is an apocalyptic number.

21379810183 is a deficient number, since it is larger than the sum of its proper divisors (3952217).

21379810183 is an equidigital number, since it uses as much as digits as its factorization.

21379810183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3952216.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 21379810183 in words is "twenty-one billion, three hundred seventy-nine million, eight hundred ten thousand, one hundred eighty-three".