5105721521 has 8 divisors (see below), whose sum is σ = 5131673664. Its totient is φ = 5079831120.

The previous prime is 5105721499. The next prime is 5105721559. The reversal of 5105721521 is 1251275015.

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-5105721521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5105721221) 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, 155111 + ... + 185123.

It is an arithmetic number, because the mean of its divisors is an integer number (641459208).

Almost surely, 2^5105721521 is an apocalyptic number.

It is an amenable number.

5105721521 is a deficient number, since it is larger than the sum of its proper divisors (25952143).

5105721521 is a wasteful number, since it uses less digits than its factorization.

5105721521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30871.

The product of its (nonzero) digits is 3500, while the sum is 29.

The square root of 5105721521 is about 71454.3317161388. The cubic root of 5105721521 is about 1721.9440702071.

Adding to 5105721521 its reverse (1251275015), we get a palindrome (6356996536).

The spelling of 5105721521 in words is "five billion, one hundred five million, seven hundred twenty-one thousand, five hundred twenty-one".