18586272021 has 8 divisors (see below), whose sum is σ = 24818303904. Its totient is φ = 12372544080.

The previous prime is 18586272011. The next prime is 18586272079. The reversal of 18586272021 is 12027268581.

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

It is not a de Polignac number, because 18586272021 - 2²³ = 18577883413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18586272011) 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 7 ways as a sum of consecutive naturals, for example, 4573615 + ... + 4577676.

It is an arithmetic number, because the mean of its divisors is an integer number (3102287988).

Almost surely, 2^18586272021 is an apocalyptic number.

It is an amenable number.

18586272021 is a deficient number, since it is larger than the sum of its proper divisors (6232031883).

18586272021 is an equidigital number, since it uses as much as digits as its factorization.

18586272021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9151971.

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 18586272021 in words is "eighteen billion, five hundred eighty-six million, two hundred seventy-two thousand, twenty-one".