21182184923 has 2 divisors, whose sum is σ = 21182184924. Its totient is φ = 21182184922.

The previous prime is 21182184911. The next prime is 21182184953. The reversal of 21182184923 is 32948128112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21182184923 - 2¹² = 21182180827 is a prime.

It is a super-2 number, since 2×21182184923² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21182184953) 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 as a sum of consecutive naturals, namely, 10591092461 + 10591092462.

It is an arithmetic number, because the mean of its divisors is an integer number (10591092462).

Almost surely, 2^21182184923 is an apocalyptic number.

21182184923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21182184923 is an equidigital number, since it uses as much as digits as its factorization.

21182184923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The spelling of 21182184923 in words is "twenty-one billion, one hundred eighty-two million, one hundred eighty-four thousand, nine hundred twenty-three".