121313252544 has 84 divisors (see below), whose sum is σ = 352806911352. Its totient is φ = 36761584640.

The previous prime is 121313252539. The next prime is 121313252549. The reversal of 121313252544 is 445252313121.

It is an interprime number because it is at equal distance from previous prime (121313252539) and next prime (121313252549).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 11 ways as a sum of consecutive naturals, for example, 2587677 + ... + 2634140.

It is an arithmetic number, because the mean of its divisors is an integer number (4200082278).

Almost surely, 2^121313252544 is an apocalyptic number.

It is an amenable number.

121313252544 is an abundant number, since it is smaller than the sum of its proper divisors (231493658808).

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

121313252544 is a wasteful number, since it uses less digits than its factorization.

121313252544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221854 (or 5221833 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

Adding to 121313252544 its reverse (445252313121), we get a palindrome (566565565665).

The spelling of 121313252544 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred fifty-two thousand, five hundred forty-four".