18021831127 has 4 divisors (see below), whose sum is σ = 18268705600. Its totient is φ = 17774956656.

The previous prime is 18021831119. The next prime is 18021831143. The reversal of 18021831127 is 72113812081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18021831127 - 2³ = 18021831119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18021831092 and 18021831101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021831197) 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, 123437127 + ... + 123437272.

It is an arithmetic number, because the mean of its divisors is an integer number (4567176400).

Almost surely, 2^18021831127 is an apocalyptic number.

18021831127 is a deficient number, since it is larger than the sum of its proper divisors (246874473).

18021831127 is an equidigital number, since it uses as much as digits as its factorization.

18021831127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246874472.

The product of its (nonzero) digits is 5376, while the sum is 34.

The spelling of 18021831127 in words is "eighteen billion, twenty-one million, eight hundred thirty-one thousand, one hundred twenty-seven".