18421236813 has 8 divisors (see below), whose sum is σ = 28070456128. Its totient is φ = 10526421024.

The previous prime is 18421236803. The next prime is 18421236833. The reversal of 18421236813 is 31863212481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18421236813 - 2⁵ = 18421236781 is a prime.

It is a super-3 number, since 3×18421236813³ (a number of 32 digits) contains 333 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 (18421236803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438600856 + ... + 438600897.

It is an arithmetic number, because the mean of its divisors is an integer number (3508807016).

Almost surely, 2^18421236813 is an apocalyptic number.

It is an amenable number.

18421236813 is a deficient number, since it is larger than the sum of its proper divisors (9649219315).

18421236813 is an equidigital number, since it uses as much as digits as its factorization.

18421236813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877201763.

The product of its digits is 55296, while the sum is 39.

The spelling of 18421236813 in words is "eighteen billion, four hundred twenty-one million, two hundred thirty-six thousand, eight hundred thirteen".