121868986 has 4 divisors (see below), whose sum is σ = 182803482. Its totient is φ = 60934492.

The previous prime is 121868969. The next prime is 121868987. The reversal of 121868986 is 689868121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689868121 = 173 ⋅3987677.

It can be written as a sum of positive squares in only one way, i.e., 120318961 + 1550025 = 10969^2 + 1245^2 .

It is not an unprimeable number, because it can be changed into a prime (121868987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30467245 + ... + 30467248.

Almost surely, 2^121868986 is an apocalyptic number.

121868986 is a deficient number, since it is larger than the sum of its proper divisors (60934496).

121868986 is an equidigital number, since it uses as much as digits as its factorization.

121868986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60934495.

The product of its digits is 331776, while the sum is 49.

The square root of 121868986 is about 11039.4286989862. The cubic root of 121868986 is about 495.7899653774.

The spelling of 121868986 in words is "one hundred twenty-one million, eight hundred sixty-eight thousand, nine hundred eighty-six".