121240312040 has 16 divisors (see below), whose sum is σ = 272790702180. Its totient is φ = 48496124800.

The previous prime is 121240312031. The next prime is 121240312049. The reversal of 121240312040 is 40213042121.

It is an interprime number because it is at equal distance from previous prime (121240312031) and next prime (121240312049).

It can be written as a sum of positive squares in 2 ways, for example, as 111431786596 + 9808525444 = 333814^2 + 99038^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (121240312049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515503861 + ... + 1515503940.

Almost surely, 2^121240312040 is an apocalyptic number.

121240312040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121240312040 is an abundant number, since it is smaller than the sum of its proper divisors (151550390140).

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

121240312040 is a wasteful number, since it uses less digits than its factorization.

121240312040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031007812 (or 3031007808 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 121240312040 its reverse (40213042121), we get a palindrome (161453354161).

The spelling of 121240312040 in words is "one hundred twenty-one billion, two hundred forty million, three hundred twelve thousand, forty".