121634989856 has 24 divisors (see below), whose sum is σ = 240179497740. Its totient is φ = 60637022208.

The previous prime is 121634989789. The next prime is 121634989867. The reversal of 121634989856 is 658989436121.

It can be written as a sum of positive squares in 2 ways, for example, as 114826099600 + 6808890256 = 338860^2 + 82516^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5628821 + ... + 5650388.

Almost surely, 2^121634989856 is an apocalyptic number.

121634989856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121634989856 is a deficient number, since it is larger than the sum of its proper divisors (118544507884).

121634989856 is a wasteful number, since it uses less digits than its factorization.

121634989856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11279556 (or 11279548 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 62.

The spelling of 121634989856 in words is "one hundred twenty-one billion, six hundred thirty-four million, nine hundred eighty-nine thousand, eight hundred fifty-six".