121705650 has 144 divisors (see below), whose sum is σ = 372565440. Its totient is φ = 28195200.

The previous prime is 121705603. The next prime is 121705651. The reversal of 121705650 is 56507121.

121705650 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 0 + 5 + 650 = 666.

It is not an unprimeable number, because it can be changed into a prime (121705651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 113316 + ... + 114384.

It is an arithmetic number, because the mean of its divisors is an integer number (2587260).

Almost surely, 2^121705650 is an apocalyptic number.

121705650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121705650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186282720).

121705650 is an abundant number, since it is smaller than the sum of its proper divisors (250859790).

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

121705650 is a wasteful number, since it uses less digits than its factorization.

121705650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 121705650 is about 11032.0283719722. The cubic root of 121705650 is about 495.5683707026.

The spelling of 121705650 in words is "one hundred twenty-one million, seven hundred five thousand, six hundred fifty".