121235873634 has 32 divisors (see below), whose sum is σ = 269673983040. Its totient is φ = 40372818336.

The previous prime is 121235873611. The next prime is 121235873639. The reversal of 121235873634 is 436378532121.

121235873634 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 3 + 5 + 8 + 7 + 3 + 634 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 121235873634.

It is not an unprimeable number, because it can be changed into a prime (121235873639) by changing a digit.

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, 1030912 + ... + 1142475.

It is an arithmetic number, because the mean of its divisors is an integer number (8427311970).

Almost surely, 2^121235873634 is an apocalyptic number.

121235873634 is an abundant number, since it is smaller than the sum of its proper divisors (148438109406).

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

121235873634 is a wasteful number, since it uses less digits than its factorization.

121235873634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174431 (or 2174425 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 121235873634 in words is "one hundred twenty-one billion, two hundred thirty-five million, eight hundred seventy-three thousand, six hundred thirty-four".