18072421416 has 96 divisors (see below), whose sum is σ = 57742963200. Its totient is φ = 4996978560.

The previous prime is 18072421403. The next prime is 18072421417. The reversal of 18072421416 is 61412427081.

It is a happy number.

It is a super-2 number, since 2×18072421416² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18072421417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 562731 + ... + 593978.

It is an arithmetic number, because the mean of its divisors is an integer number (601489200).

Almost surely, 2^18072421416 is an apocalyptic number.

It is an amenable number.

18072421416 is an abundant number, since it is smaller than the sum of its proper divisors (39670541784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18072421416 is a wasteful number, since it uses less digits than its factorization.

18072421416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156759 (or 1156752 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

Adding to 18072421416 its reverse (61412427081), we get a palindrome (79484848497).

The spelling of 18072421416 in words is "eighteen billion, seventy-two million, four hundred twenty-one thousand, four hundred sixteen".