121388331187664 has 20 divisors (see below), whose sum is σ = 235272792677604. Its totient is φ = 60672771787008.

The previous prime is 121388331187517. The next prime is 121388331187679. The reversal of 121388331187664 is 466781133883121.

It can be written as a sum of positive squares in 2 ways, for example, as 48779049640000 + 72609281547664 = 6984200^2 + 8521108^2 .

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 121388331187597 and 121388331187606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1337066117 + ... + 1337156900.

Almost surely, 2^{121388331187664} is an apocalyptic number.

It is an amenable number.

121388331187664 is a deficient number, since it is larger than the sum of its proper divisors (113884461489940).

121388331187664 is a wasteful number, since it uses less digits than its factorization.

121388331187664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674225862 (or 2674225856 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 62.

The spelling of 121388331187664 in words is "one hundred twenty-one trillion, three hundred eighty-eight billion, three hundred thirty-one million, one hundred eighty-seven thousand, six hundred sixty-four".