121805136 has 60 divisors (see below), whose sum is σ = 360944532. Its totient is φ = 38212608.

The previous prime is 121805113. The next prime is 121805141. The reversal of 121805136 is 631508121.

It can be written as a sum of positive squares in 2 ways, for example, as 38192400 + 83612736 = 6180^2 + 9144^2 .

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 22431 + ... + 27326.

Almost surely, 2^121805136 is an apocalyptic number.

121805136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121805136 is an abundant number, since it is smaller than the sum of its proper divisors (239139396).

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

121805136 is a wasteful number, since it uses less digits than its factorization.

121805136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49788 (or 49779 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 121805136 is about 11036.5364132050. The cubic root of 121805136 is about 495.7033649485.

The spelling of 121805136 in words is "one hundred twenty-one million, eight hundred five thousand, one hundred thirty-six".