121643100 has 72 divisors (see below), whose sum is σ = 391068720. Its totient is φ = 32437440.

The previous prime is 121643099. The next prime is 121643131. The reversal of 121643100 is 1346121.

It is a happy number.

121643100 is a `hidden beast` number, since 1 + 21 + 643 + 1 + 0 + 0 = 666.

It is a super-2 number, since 2×121643100² = 29594087555220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19827 + ... + 25226.

It is an arithmetic number, because the mean of its divisors is an integer number (5431510).

Almost surely, 2^121643100 is an apocalyptic number.

121643100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121643100 is an abundant number, since it is smaller than the sum of its proper divisors (269425620).

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

121643100 is a wasteful number, since it uses less digits than its factorization.

121643100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45076 (or 45063 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 121643100 is about 11029.1930801850. The cubic root of 121643100 is about 495.4834578726.

Adding to 121643100 its reverse (1346121), we get a palindrome (122989221).

The spelling of 121643100 in words is "one hundred twenty-one million, six hundred forty-three thousand, one hundred".