18229346521 has 4 divisors (see below), whose sum is σ = 18229818832. Its totient is φ = 18228874212.

The previous prime is 18229346507. The next prime is 18229346537. The reversal of 18229346521 is 12564392281.

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 18229346521 - 2⁷ = 18229346393 is a prime.

It is a super-3 number, since 3×18229346521³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18229346561) 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, 172551 + ... + 257356.

It is an arithmetic number, because the mean of its divisors is an integer number (4557454708).

Almost surely, 2^18229346521 is an apocalyptic number.

It is an amenable number.

18229346521 is a deficient number, since it is larger than the sum of its proper divisors (472311).

18229346521 is an equidigital number, since it uses as much as digits as its factorization.

18229346521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472310.

The product of its digits is 207360, while the sum is 43.

The spelling of 18229346521 in words is "eighteen billion, two hundred twenty-nine million, three hundred forty-six thousand, five hundred twenty-one".