18402131112 has 16 divisors (see below), whose sum is σ = 46005327840. Its totient is φ = 6134043696.

The previous prime is 18402131107. The next prime is 18402131131. The reversal of 18402131112 is 21113120481.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 766755463 = 18402131112 / (1 + 8 + 4 + 0 + 2 + 1 + 3 + 1 + 1 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383377708 + ... + 383377755.

It is an arithmetic number, because the mean of its divisors is an integer number (2875332990).

Almost surely, 2^18402131112 is an apocalyptic number.

18402131112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18402131112 is an abundant number, since it is smaller than the sum of its proper divisors (27603196728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18402131112 is a wasteful number, since it uses less digits than its factorization.

18402131112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766755472 (or 766755468 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

Adding to 18402131112 its reverse (21113120481), we get a palindrome (39515251593).

The spelling of 18402131112 in words is "eighteen billion, four hundred two million, one hundred thirty-one thousand, one hundred twelve".