218021110481 has 4 divisors (see below), whose sum is σ = 221716383600. Its totient is φ = 214325837364.

The previous prime is 218021110477. The next prime is 218021110493. The reversal of 218021110481 is 184011120812.

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 218021110481 - 2² = 218021110477 is a prime.

It is a super-2 number, since 2×218021110481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218021110441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847636471 + ... + 1847636588.

It is an arithmetic number, because the mean of its divisors is an integer number (55429095900).

Almost surely, 2^218021110481 is an apocalyptic number.

It is an amenable number.

218021110481 is a deficient number, since it is larger than the sum of its proper divisors (3695273119).

218021110481 is an equidigital number, since it uses as much as digits as its factorization.

218021110481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695273118.

The product of its (nonzero) digits is 1024, while the sum is 29.

The spelling of 218021110481 in words is "two hundred eighteen billion, twenty-one million, one hundred ten thousand, four hundred eighty-one".