121689100 has 36 divisors (see below), whose sum is σ = 284381104. Its totient is φ = 44930880.

The previous prime is 121689037. The next prime is 121689109. The reversal of 121689100 is 1986121.

It is a happy 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 11 ways as a sum of consecutive naturals, for example, 45504 + ... + 48103.

Almost surely, 2^121689100 is an apocalyptic number.

121689100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121689100 is an abundant number, since it is smaller than the sum of its proper divisors (162692004).

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

121689100 is a wasteful number, since it uses less digits than its factorization.

121689100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93634 (or 93627 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 121689100 is about 11031.2782577542. The cubic root of 121689100 is about 495.5459065898.

The spelling of 121689100 in words is "one hundred twenty-one million, six hundred eighty-nine thousand, one hundred".