18000121240 has 32 divisors (see below), whose sum is σ = 40508041680. Its totient is φ = 7198667392.

The previous prime is 18000121229. The next prime is 18000121247. The reversal of 18000121240 is 4212100081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000121247) 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, 182547 + ... + 263293.

Almost surely, 2^18000121240 is an apocalyptic number.

18000121240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18000121240 is an abundant number, since it is smaller than the sum of its proper divisors (22507920440).

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

18000121240 is a wasteful number, since it uses less digits than its factorization.

18000121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86331 (or 86327 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The spelling of 18000121240 in words is "eighteen billion, one hundred twenty-one thousand, two hundred forty".