12121836240 has 40 divisors (see below), whose sum is σ = 37577693088. Its totient is φ = 3232489600.

The previous prime is 12121836229. The next prime is 12121836241. The reversal of 12121836240 is 4263812121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12121836198 and 12121836207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121836241) 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, 25253586 + ... + 25254065.

Almost surely, 2^12121836240 is an apocalyptic number.

12121836240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121836240 is an abundant number, since it is smaller than the sum of its proper divisors (25455856848).

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

12121836240 is a wasteful number, since it uses less digits than its factorization.

12121836240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50507667 (or 50507661 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The spelling of 12121836240 in words is "twelve billion, one hundred twenty-one million, eight hundred thirty-six thousand, two hundred forty".