5172721101 has 128 divisors (see below), whose sum is σ = 8755200000. Its totient is φ = 3003713280.

The previous prime is 5172721069. The next prime is 5172721123. The reversal of 5172721101 is 1011272715.

5172721101 is a `hidden beast` number, since 517 + 27 + 21 + 101 = 666.

It is not a de Polignac number, because 5172721101 - 2⁵ = 5172721069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5172722101) 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 127 ways as a sum of consecutive naturals, for example, 34716175 + ... + 34716323.

It is an arithmetic number, because the mean of its divisors is an integer number (68400000).

Almost surely, 2^5172721101 is an apocalyptic number.

It is an amenable number.

5172721101 is a deficient number, since it is larger than the sum of its proper divisors (3582478899).

5172721101 is a wasteful number, since it uses less digits than its factorization.

5172721101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 27.

The square root of 5172721101 is about 71921.6316625256. The cubic root of 5172721101 is about 1729.4434042029.

Adding to 5172721101 its reverse (1011272715), we get a palindrome (6183993816).

The spelling of 5172721101 in words is "five billion, one hundred seventy-two million, seven hundred twenty-one thousand, one hundred one".