15245860120721 has 8 divisors (see below), whose sum is σ = 15658081371264. Its totient is φ = 14833647869040.

The previous prime is 15245860120681. The next prime is 15245860120831. The reversal of 15245860120721 is 12702106854251.

It is a happy number.

15245860120721 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15245860120721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15245860123721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1257416 + ... + 5663286.

It is an arithmetic number, because the mean of its divisors is an integer number (1957260171408).

Almost surely, 2^{15245860120721} is an apocalyptic number.

It is an amenable number.

15245860120721 is a deficient number, since it is larger than the sum of its proper divisors (412221250543).

15245860120721 is an equidigital number, since it uses as much as digits as its factorization.

15245860120721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499431.

The product of its (nonzero) digits is 268800, while the sum is 44.

Adding to 15245860120721 its reverse (12702106854251), we get a palindrome (27947966974972).

The spelling of 15245860120721 in words is "fifteen trillion, two hundred forty-five billion, eight hundred sixty million, one hundred twenty thousand, seven hundred twenty-one".