121388526789 has 16 divisors (see below), whose sum is σ = 173162815680. Its totient is φ = 75409608960.

The previous prime is 121388526769. The next prime is 121388526893. The reversal of 121388526789 is 987625883121.

It is not a de Polignac number, because 121388526789 - 2⁷ = 121388526661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121388526769) 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, 17452452 + ... + 17459405.

It is an arithmetic number, because the mean of its divisors is an integer number (10822675980).

Almost surely, 2^121388526789 is an apocalyptic number.

121388526789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

121388526789 is a deficient number, since it is larger than the sum of its proper divisors (51774288891).

121388526789 is a wasteful number, since it uses less digits than its factorization.

121388526789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34911940.

The product of its digits is 11612160, while the sum is 60.

The spelling of 121388526789 in words is "one hundred twenty-one billion, three hundred eighty-eight million, five hundred twenty-six thousand, seven hundred eighty-nine".