121989136 has 20 divisors (see below), whose sum is σ = 236530000. Its totient is φ = 60949152.

The previous prime is 121989121. The next prime is 121989143. The reversal of 121989136 is 631989121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33115 + ... + 36613.

It is an arithmetic number, because the mean of its divisors is an integer number (11826500).

Almost surely, 2^121989136 is an apocalyptic number.

121989136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121989136 is a deficient number, since it is larger than the sum of its proper divisors (114540864).

121989136 is a wasteful number, since it uses less digits than its factorization.

121989136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5686 (or 5680 counting only the distinct ones).

The product of its digits is 23328, while the sum is 40.

The square root of 121989136 is about 11044.8692160659. The cubic root of 121989136 is about 495.9528441121.

The spelling of 121989136 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, one hundred thirty-six".