121312202040 has 128 divisors (see below), whose sum is σ = 417418444800. Its totient is φ = 31306366080.

The previous prime is 121312202017. The next prime is 121312202083. The reversal of 121312202040 is 40202213121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 1778232 + ... + 1845191.

It is an arithmetic number, because the mean of its divisors is an integer number (3261081600).

Almost surely, 2^121312202040 is an apocalyptic number.

121312202040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121312202040 is an abundant number, since it is smaller than the sum of its proper divisors (296106242760).

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

121312202040 is a wasteful number, since it uses less digits than its factorization.

121312202040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623474 (or 3623464 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 121312202040 its reverse (40202213121), we get a palindrome (161514415161).

The spelling of 121312202040 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred two thousand, forty".