121644260447 has 12 divisors (see below), whose sum is σ = 127222034184. Its totient is φ = 116301448560.

The previous prime is 121644260407. The next prime is 121644260449. The reversal of 121644260447 is 744062446121.

It is not a de Polignac number, because 121644260447 - 2¹⁶ = 121644194911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121644260449) 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 11 ways as a sum of consecutive naturals, for example, 1113197 + ... + 1217577.

It is an arithmetic number, because the mean of its divisors is an integer number (10601836182).

Almost surely, 2^121644260447 is an apocalyptic number.

121644260447 is a deficient number, since it is larger than the sum of its proper divisors (5577773737).

121644260447 is a wasteful number, since it uses less digits than its factorization.

121644260447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106630 (or 106607 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 41.

The spelling of 121644260447 in words is "one hundred twenty-one billion, six hundred forty-four million, two hundred sixty thousand, four hundred forty-seven".