121581812852 has 12 divisors (see below), whose sum is σ = 212771069280. Its totient is φ = 60790078776.

The previous prime is 121581812851. The next prime is 121581812867. The reversal of 121581812852 is 258218185121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121581812851) 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, 222743 + ... + 541089.

It is an arithmetic number, because the mean of its divisors is an integer number (17730922440).

Almost surely, 2^121581812852 is an apocalyptic number.

It is an amenable number.

121581812852 is a deficient number, since it is larger than the sum of its proper divisors (91189256428).

121581812852 is a wasteful number, since it uses less digits than its factorization.

121581812852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413830 (or 413828 counting only the distinct ones).

The product of its digits is 102400, while the sum is 44.

Adding to 121581812852 its reverse (258218185121), we get a palindrome (379799997973).

The spelling of 121581812852 in words is "one hundred twenty-one billion, five hundred eighty-one million, eight hundred twelve thousand, eight hundred fifty-two".