18826191021 has 32 divisors (see below), whose sum is σ = 28839283200. Its totient is φ = 10803862080.

The previous prime is 18826191019. The next prime is 18826191023. The reversal of 18826191021 is 12019162881.

It is an interprime number because it is at equal distance from previous prime (18826191019) and next prime (18826191023).

It is not a de Polignac number, because 18826191021 - 2¹ = 18826191019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18826191023) 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 31 ways as a sum of consecutive naturals, for example, 1471470 + ... + 1484208.

It is an arithmetic number, because the mean of its divisors is an integer number (901227600).

Almost surely, 2^18826191021 is an apocalyptic number.

18826191021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18826191021 is a deficient number, since it is larger than the sum of its proper divisors (10013092179).

18826191021 is a wasteful number, since it uses less digits than its factorization.

18826191021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15129.

The product of its (nonzero) digits is 13824, while the sum is 39.

The spelling of 18826191021 in words is "eighteen billion, eight hundred twenty-six million, one hundred ninety-one thousand, twenty-one".