121654636356 has 48 divisors (see below), whose sum is σ = 309901209408. Its totient is φ = 36837081600.

The previous prime is 121654636321. The next prime is 121654636387. The reversal of 121654636356 is 653636456121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174465 + ... + 523208.

It is an arithmetic number, because the mean of its divisors is an integer number (6456275196).

Almost surely, 2^121654636356 is an apocalyptic number.

It is an amenable number.

121654636356 is an abundant number, since it is smaller than the sum of its proper divisors (188246573052).

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

121654636356 is a wasteful number, since it uses less digits than its factorization.

121654636356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699012 (or 699010 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 48.

The spelling of 121654636356 in words is "one hundred twenty-one billion, six hundred fifty-four million, six hundred thirty-six thousand, three hundred fifty-six".