121984455 has 16 divisors (see below), whose sum is σ = 195377760. Its totient is φ = 64990848.

The previous prime is 121984441. The next prime is 121984459. The reversal of 121984455 is 554489121.

It is not a de Polignac number, because 121984455 - 2⁴ = 121984439 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121984459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12969 + ... + 20301.

It is an arithmetic number, because the mean of its divisors is an integer number (12211110).

Almost surely, 2^121984455 is an apocalyptic number.

121984455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121984455 is a deficient number, since it is larger than the sum of its proper divisors (73393305).

121984455 is a wasteful number, since it uses less digits than its factorization.

121984455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8450.

The product of its digits is 57600, while the sum is 39.

The square root of 121984455 is about 11044.6573056840. The cubic root of 121984455 is about 495.9465004189.

It can be divided in two parts, 12198 and 4455, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 121984455 in words is "one hundred twenty-one million, nine hundred eighty-four thousand, four hundred fifty-five".