121313252540 has 12 divisors (see below), whose sum is σ = 254757830376. Its totient is φ = 48525301008.

The previous prime is 121313252539. The next prime is 121313252549. The reversal of 121313252540 is 45252313121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121313252549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3032831294 + ... + 3032831333.

It is an arithmetic number, because the mean of its divisors is an integer number (21229819198).

Almost surely, 2^121313252540 is an apocalyptic number.

121313252540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121313252540 is an abundant number, since it is smaller than the sum of its proper divisors (133444577836).

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

121313252540 is a wasteful number, since it uses less digits than its factorization.

121313252540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065662636 (or 6065662634 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 121313252540 its reverse (45252313121), we get a palindrome (166565565661).

The spelling of 121313252540 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred fifty-two thousand, five hundred forty".