5251716421 has 8 divisors (see below), whose sum is σ = 6007616384. Its totient is φ = 4497230160.

The previous prime is 5251716419. The next prime is 5251716473. The reversal of 5251716421 is 1246171525.

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

It is a cyclic number.

It is not a de Polignac number, because 5251716421 - 2¹ = 5251716419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5251716121) 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, 345450 + ... + 360331.

It is an arithmetic number, because the mean of its divisors is an integer number (750952048).

Almost surely, 2^5251716421 is an apocalyptic number.

It is an amenable number.

5251716421 is a deficient number, since it is larger than the sum of its proper divisors (755899963).

5251716421 is a wasteful number, since it uses less digits than its factorization.

5251716421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706851.

The product of its digits is 16800, while the sum is 34.

The square root of 5251716421 is about 72468.7271931831. The cubic root of 5251716421 is about 1738.2027089525.

Adding to 5251716421 its reverse (1246171525), we get a palindrome (6497887946).

The spelling of 5251716421 in words is "five billion, two hundred fifty-one million, seven hundred sixteen thousand, four hundred twenty-one".