121313023440 has 160 divisors (see below), whose sum is σ = 448481581056. Its totient is φ = 26523087360.

The previous prime is 121313023421. The next prime is 121313023453. The reversal of 121313023440 is 44320313121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121313023440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1531146 + ... + 1608425.

Almost surely, 2^121313023440 is an apocalyptic number.

121313023440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121313023440 is an abundant number, since it is smaller than the sum of its proper divisors (327168557616).

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

121313023440 is a wasteful number, since it uses less digits than its factorization.

121313023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139617 (or 3139611 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 121313023440 its reverse (44320313121), we get a palindrome (165633336561).

The spelling of 121313023440 in words is "one hundred twenty-one billion, three hundred thirteen million, twenty-three thousand, four hundred forty".