18491282821 has 8 divisors (see below), whose sum is σ = 20212740000. Its totient is φ = 16776564240.

The previous prime is 18491282801. The next prime is 18491282851. The reversal of 18491282821 is 12828219481.

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 18491282821 - 2²⁵ = 18457728389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18491282801) 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, 1678906 + ... + 1689883.

It is an arithmetic number, because the mean of its divisors is an integer number (2526592500).

Almost surely, 2^18491282821 is an apocalyptic number.

18491282821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18491282821 is a deficient number, since it is larger than the sum of its proper divisors (1721457179).

18491282821 is a wasteful number, since it uses less digits than its factorization.

18491282821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369299.

The product of its digits is 147456, while the sum is 46.

The spelling of 18491282821 in words is "eighteen billion, four hundred ninety-one million, two hundred eighty-two thousand, eight hundred twenty-one".