18376234021 has 2 divisors, whose sum is σ = 18376234022. Its totient is φ = 18376234020.

The previous prime is 18376233979. The next prime is 18376234043. The reversal of 18376234021 is 12043267381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17711883396 + 664350625 = 133086^2 + 25775^2 .

It is a cyclic number.

It is not a de Polignac number, because 18376234021 - 2¹⁷ = 18376102949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18376234321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9188117010 + 9188117011.

It is an arithmetic number, because the mean of its divisors is an integer number (9188117011).

Almost surely, 2^18376234021 is an apocalyptic number.

It is an amenable number.

18376234021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18376234021 is an equidigital number, since it uses as much as digits as its factorization.

18376234021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 18376234021 in words is "eighteen billion, three hundred seventy-six million, two hundred thirty-four thousand, twenty-one".