121886681 has 16 divisors (see below), whose sum is σ = 144547200. Its totient is φ = 100560768.

The previous prime is 121886669. The next prime is 121886689. The reversal of 121886681 is 186688121.

It is not a de Polignac number, because 121886681 - 2¹⁸ = 121624537 is a prime.

It is a super-2 number, since 2×121886681² = 29712726010391522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121886689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84341 + ... + 85773.

It is an arithmetic number, because the mean of its divisors is an integer number (9034200).

Almost surely, 2^121886681 is an apocalyptic number.

It is an amenable number.

121886681 is a deficient number, since it is larger than the sum of its proper divisors (22660519).

121886681 is a wasteful number, since it uses less digits than its factorization.

121886681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888.

The product of its digits is 36864, while the sum is 41.

The square root of 121886681 is about 11040.2301153554. The cubic root of 121886681 is about 495.8139599395.

The spelling of 121886681 in words is "one hundred twenty-one million, eight hundred eighty-six thousand, six hundred eighty-one".