18021400481 has 8 divisors (see below), whose sum is σ = 20844030144. Its totient is φ = 15260806800.

The previous prime is 18021400417. The next prime is 18021400483. The reversal of 18021400481 is 18400412081.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18021400481 - 2⁶ = 18021400417 is a prime.

It is a super-2 number, since 2×18021400481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18021400483) 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, 15508370 + ... + 15509531.

It is an arithmetic number, because the mean of its divisors is an integer number (2605503768).

Almost surely, 2^18021400481 is an apocalyptic number.

It is an amenable number.

18021400481 is a deficient number, since it is larger than the sum of its proper divisors (2822629663).

18021400481 is an equidigital number, since it uses as much as digits as its factorization.

18021400481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31017991.

The product of its (nonzero) digits is 2048, while the sum is 29.

The spelling of 18021400481 in words is "eighteen billion, twenty-one million, four hundred thousand, four hundred eighty-one".