5211721105 has 4 divisors (see below), whose sum is σ = 6254065332. Its totient is φ = 4169376880.

The previous prime is 5211721057. The next prime is 5211721129. The reversal of 5211721105 is 5011271125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2874675456 + 2337045649 = 53616^2 + 48343^2 .

It is not a de Polignac number, because 5211721105 - 2¹⁵ = 5211688337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5211721105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521172106 + ... + 521172115.

It is an arithmetic number, because the mean of its divisors is an integer number (1563516333).

Almost surely, 2^5211721105 is an apocalyptic number.

It is an amenable number.

5211721105 is a deficient number, since it is larger than the sum of its proper divisors (1042344227).

5211721105 is a wasteful number, since it uses less digits than its factorization.

5211721105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042344226.

The product of its (nonzero) digits is 700, while the sum is 25.

The square root of 5211721105 is about 72192.2510038300. The cubic root of 5211721105 is about 1733.7789363679.

The spelling of 5211721105 in words is "five billion, two hundred eleven million, seven hundred twenty-one thousand, one hundred five".