121387178458 has 32 divisors (see below), whose sum is σ = 226799427456. Its totient is φ = 47442725568.

The previous prime is 121387178447. The next prime is 121387178459. The reversal of 121387178458 is 854871783121.

It is a junction number, because it is equal to n+sod(n) for n = 121387178399 and 121387178408.

It is not an unprimeable number, because it can be changed into a prime (121387178459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4002741 + ... + 4032952.

It is an arithmetic number, because the mean of its divisors is an integer number (7087482108).

Almost surely, 2^121387178458 is an apocalyptic number.

121387178458 is a deficient number, since it is larger than the sum of its proper divisors (105412248998).

121387178458 is a wasteful number, since it uses less digits than its factorization.

121387178458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8035798.

The product of its digits is 3010560, while the sum is 55.

The spelling of 121387178458 in words is "one hundred twenty-one billion, three hundred eighty-seven million, one hundred seventy-eight thousand, four hundred fifty-eight".