121600000 has 144 divisors (see below), whose sum is σ = 319901400. Its totient is φ = 46080000.

The previous prime is 121599991. The next prime is 121600007. The reversal of 121600000 is 6121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 121600000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121600007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6399991 + ... + 6400009.

Almost surely, 2^121600000 is an apocalyptic number.

121600000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159950700).

121600000 is an abundant number, since it is smaller than the sum of its proper divisors (198301400).

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

121600000 is an frugal number, since it uses more digits than its factorization.

121600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 121600000 is about 11027.2390016722. The cubic root of 121600000 is about 495.4249318521.

Adding to 121600000 its reverse (6121), we get a palindrome (121606121).

The spelling of 121600000 in words is "one hundred twenty-one million, six hundred thousand".