121689108 has 24 divisors (see below), whose sum is σ = 315490560. Its totient is φ = 40563000.

The previous prime is 121689037. The next prime is 121689109. The reversal of 121689108 is 801986121.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121689109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563268 + ... + 563483.

It is an arithmetic number, because the mean of its divisors is an integer number (13145440).

Almost surely, 2^121689108 is an apocalyptic number.

121689108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121689108 is an abundant number, since it is smaller than the sum of its proper divisors (193801452).

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

121689108 is a wasteful number, since it uses less digits than its factorization.

121689108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126764 (or 1126756 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 121689108 is about 11031.2786203595. The cubic root of 121689108 is about 495.5459174491.

The spelling of 121689108 in words is "one hundred twenty-one million, six hundred eighty-nine thousand, one hundred eight".