6384543249921 has 16 divisors (see below), whose sum is σ = 8744099606784. Its totient is φ = 4141721477504.

The previous prime is 6384543249817. The next prime is 6384543249937. The reversal of 6384543249921 is 1299423454836.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6384543249921 - 2⁷ = 6384543249793 is a prime.

It is a super-2 number, since 2×6384543249921² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6384543244921) 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, 130843956 + ... + 130892741.

It is an arithmetic number, because the mean of its divisors is an integer number (546506225424).

Almost surely, 2^{6384543249921} is an apocalyptic number.

It is an amenable number.

6384543249921 is a deficient number, since it is larger than the sum of its proper divisors (2359556356863).

6384543249921 is a wasteful number, since it uses less digits than its factorization.

6384543249921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261736920.

The product of its digits is 44789760, while the sum is 60.

The spelling of 6384543249921 in words is "six trillion, three hundred eighty-four billion, five hundred forty-three million, two hundred forty-nine thousand, nine hundred twenty-one".