121801100 has 36 divisors (see below), whose sum is σ = 275805264. Its totient is φ = 46601280.

The previous prime is 121801091. The next prime is 121801103. The reversal of 121801100 is 1108121.

It is a super-2 number, since 2×121801100² = 29671015922420000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121801103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24179 + ... + 28778.

Almost surely, 2^121801100 is an apocalyptic number.

121801100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121801100 is an abundant number, since it is smaller than the sum of its proper divisors (154004164).

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

121801100 is a wasteful number, since it uses less digits than its factorization.

121801100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52994 (or 52987 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 121801100 is about 11036.3535644705. The cubic root of 121801100 is about 495.6978898622.

Adding to 121801100 its reverse (1108121), we get a palindrome (122909221).

The spelling of 121801100 in words is "one hundred twenty-one million, eight hundred one thousand, one hundred".