121659711438 has 32 divisors (see below), whose sum is σ = 257717817504. Its totient is φ = 38155087872.

The previous prime is 121659711367. The next prime is 121659711449. The reversal of 121659711438 is 834117956121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113406 + ... + 506142.

It is an arithmetic number, because the mean of its divisors is an integer number (8053681797).

Almost surely, 2^121659711438 is an apocalyptic number.

121659711438 is an abundant number, since it is smaller than the sum of its proper divisors (136058106066).

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

121659711438 is a wasteful number, since it uses less digits than its factorization.

121659711438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395796.

The product of its digits is 362880, while the sum is 48.

The spelling of 121659711438 in words is "one hundred twenty-one billion, six hundred fifty-nine million, seven hundred eleven thousand, four hundred thirty-eight".