10389965721 has 8 divisors (see below), whose sum is σ = 13877299104. Its totient is φ = 6914638080.

The previous prime is 10389965683. The next prime is 10389965741. The reversal of 10389965721 is 12756998301.

10389965721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10389965721 - 2¹⁴ = 10389949337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10389965741) 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 7 ways as a sum of consecutive naturals, for example, 2999415 + ... + 3002876.

It is an arithmetic number, because the mean of its divisors is an integer number (1734662388).

Almost surely, 2^10389965721 is an apocalyptic number.

It is an amenable number.

10389965721 is a deficient number, since it is larger than the sum of its proper divisors (3487333383).

10389965721 is an equidigital number, since it uses as much as digits as its factorization.

10389965721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002871.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 10389965721 in words is "ten billion, three hundred eighty-nine million, nine hundred sixty-five thousand, seven hundred twenty-one".