121361718592 has 56 divisors (see below), whose sum is σ = 249203946600. Its totient is φ = 58571390976.

The previous prime is 121361718551. The next prime is 121361718593. The reversal of 121361718592 is 295817163121.

It can be written as a sum of positive squares in 4 ways, for example, as 3674299456 + 117687419136 = 60616^2 + 343056^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121361718593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8368884 + ... + 8383372.

It is an arithmetic number, because the mean of its divisors is an integer number (4450070475).

Almost surely, 2^121361718592 is an apocalyptic number.

It is an amenable number.

121361718592 is an abundant number, since it is smaller than the sum of its proper divisors (127842228008).

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

121361718592 is a wasteful number, since it uses less digits than its factorization.

121361718592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19043 (or 19033 counting only the distinct ones).

The product of its digits is 181440, while the sum is 46.

The spelling of 121361718592 in words is "one hundred twenty-one billion, three hundred sixty-one million, seven hundred eighteen thousand, five hundred ninety-two".