121440210405 has 16 divisors (see below), whose sum is σ = 194309505600. Its totient is φ = 64766389248.

The previous prime is 121440210403. The next prime is 121440210449. The reversal of 121440210405 is 504012044121.

It is not a de Polignac number, because 121440210405 - 2¹ = 121440210403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121440210403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644421 + ... + 811269.

It is an arithmetic number, because the mean of its divisors is an integer number (12144344100).

Almost surely, 2^121440210405 is an apocalyptic number.

121440210405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121440210405 is a deficient number, since it is larger than the sum of its proper divisors (72869295195).

121440210405 is a wasteful number, since it uses less digits than its factorization.

121440210405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215380.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 121440210405 its reverse (504012044121), we get a palindrome (625452254526).

The spelling of 121440210405 in words is "one hundred twenty-one billion, four hundred forty million, two hundred ten thousand, four hundred five".