121731016536 has 80 divisors (see below), whose sum is σ = 341021177640. Its totient is φ = 40569672960.

The previous prime is 121731016409. The next prime is 121731016541. The reversal of 121731016536 is 635610137121.

121731016536 is a `hidden beast` number, since 1 + 2 + 17 + 3 + 101 + 6 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 121731016536.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4497235 + ... + 4524221.

Almost surely, 2^121731016536 is an apocalyptic number.

It is an amenable number.

121731016536 is an abundant number, since it is smaller than the sum of its proper divisors (219290161104).

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

121731016536 is a wasteful number, since it uses less digits than its factorization.

121731016536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33966 (or 33953 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 121731016536 in words is "one hundred twenty-one billion, seven hundred thirty-one million, sixteen thousand, five hundred thirty-six".