121310440040 has 16 divisors (see below), whose sum is σ = 272948490180. Its totient is φ = 48524176000.

The previous prime is 121310440039. The next prime is 121310440051. The reversal of 121310440040 is 40044013121.

It can be written as a sum of positive squares in 2 ways, for example, as 111303638884 + 10006801156 = 333622^2 + 100034^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121310439994 and 121310440021.

It is an unprimeable number.

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, 1516380461 + ... + 1516380540.

Almost surely, 2^121310440040 is an apocalyptic number.

121310440040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121310440040 is an abundant number, since it is smaller than the sum of its proper divisors (151638050140).

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

121310440040 is a wasteful number, since it uses less digits than its factorization.

121310440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032761012 (or 3032761008 counting only the distinct ones).

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

Adding to 121310440040 its reverse (40044013121), we get a palindrome (161354453161).

The spelling of 121310440040 in words is "one hundred twenty-one billion, three hundred ten million, four hundred forty thousand, forty".