121735636728 has 32 divisors (see below), whose sum is σ = 312564474960. Its totient is φ = 39481827840.

The previous prime is 121735636709. The next prime is 121735636739. The reversal of 121735636728 is 827636537121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68543953 + ... + 68545728.

Almost surely, 2^121735636728 is an apocalyptic number.

It is an amenable number.

121735636728 is an abundant number, since it is smaller than the sum of its proper divisors (190828838232).

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

121735636728 is a wasteful number, since it uses less digits than its factorization.

121735636728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137089727 (or 137089723 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The spelling of 121735636728 in words is "one hundred twenty-one billion, seven hundred thirty-five million, six hundred thirty-six thousand, seven hundred twenty-eight".