5210216721 has 6 divisors (see below), whose sum is σ = 7525868610. Its totient is φ = 3473477808.

The previous prime is 5210216719. The next prime is 5210216731. The reversal of 5210216721 is 1276120125.

It can be written as a sum of positive squares in only one way, i.e., 4006890000 + 1203326721 = 63300^2 + 34689^2 .

It is not a de Polignac number, because 5210216721 - 2¹ = 5210216719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5210216731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 289456476 + ... + 289456493.

It is an arithmetic number, because the mean of its divisors is an integer number (1254311435).

Almost surely, 2^5210216721 is an apocalyptic number.

It is an amenable number.

5210216721 is a deficient number, since it is larger than the sum of its proper divisors (2315651889).

5210216721 is a wasteful number, since it uses less digits than its factorization.

5210216721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578912975 (or 578912972 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 5210216721 is about 72181.8309618148. The cubic root of 5210216721 is about 1733.6120995884.

Adding to 5210216721 its reverse (1276120125), we get a palindrome (6486336846).

The spelling of 5210216721 in words is "five billion, two hundred ten million, two hundred sixteen thousand, seven hundred twenty-one".