8259013721 has 8 divisors (see below), whose sum is σ = 9522403584. Its totient is φ = 7016506560.

The previous prime is 8259013703. The next prime is 8259013739. The reversal of 8259013721 is 1273109528.

It is an interprime number because it is at equal distance from previous prime (8259013703) and next prime (8259013739).

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

It is a de Polignac number, because none of the positive numbers 2^k-8259013721 is a prime.

It is a super-2 number, since 2×8259013721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8259013771) 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, 5219825 + ... + 5221406.

It is an arithmetic number, because the mean of its divisors is an integer number (1190300448).

Almost surely, 2^8259013721 is an apocalyptic number.

It is an amenable number.

8259013721 is a deficient number, since it is larger than the sum of its proper divisors (1263389863).

8259013721 is a wasteful number, since it uses less digits than its factorization.

8259013721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10441351.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 8259013721 is about 90879.1159783148. The cubic root of 8259013721 is about 2021.3556335808.

The spelling of 8259013721 in words is "eight billion, two hundred fifty-nine million, thirteen thousand, seven hundred twenty-one".