5105217821 has 4 divisors (see below), whose sum is σ = 5569328544. Its totient is φ = 4641107100.

The previous prime is 5105217809. The next prime is 5105217829. The reversal of 5105217821 is 1287125015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5105217821 - 2⁶ = 5105217757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5105217829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232055345 + ... + 232055366.

It is an arithmetic number, because the mean of its divisors is an integer number (1392332136).

Almost surely, 2^5105217821 is an apocalyptic number.

It is an amenable number.

5105217821 is a deficient number, since it is larger than the sum of its proper divisors (464110723).

5105217821 is a wasteful number, since it uses less digits than its factorization.

5105217821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464110722.

The product of its (nonzero) digits is 5600, while the sum is 32.

The square root of 5105217821 is about 71450.8070003412. The cubic root of 5105217821 is about 1721.8874427714.

The spelling of 5105217821 in words is "five billion, one hundred five million, two hundred seventeen thousand, eight hundred twenty-one".