121276550721 has 16 divisors (see below), whose sum is σ = 165578342400. Its totient is φ = 78921975888.

The previous prime is 121276550719. The next prime is 121276550789. The reversal of 121276550721 is 127055672121.

It is not a de Polignac number, because 121276550721 - 2¹ = 121276550719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121276550721.

It is not an unprimeable number, because it can be changed into a prime (121276550701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081281 + ... + 1188158.

It is an arithmetic number, because the mean of its divisors is an integer number (10348646400).

Almost surely, 2^121276550721 is an apocalyptic number.

It is an amenable number.

121276550721 is a deficient number, since it is larger than the sum of its proper divisors (44301791679).

121276550721 is a wasteful number, since it uses less digits than its factorization.

121276550721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269868.

The product of its (nonzero) digits is 58800, while the sum is 39.

The spelling of 121276550721 in words is "one hundred twenty-one billion, two hundred seventy-six million, five hundred fifty thousand, seven hundred twenty-one".