5219205721 has 4 divisors (see below), whose sum is σ = 5251225552. Its totient is φ = 5187185892.

The previous prime is 5219205707. The next prime is 5219205749. The reversal of 5219205721 is 1275029125.

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 5219205721 - 2¹⁵ = 5219172953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5219205791) 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, 16009671 + ... + 16009996.

It is an arithmetic number, because the mean of its divisors is an integer number (1312806388).

Almost surely, 2^5219205721 is an apocalyptic number.

It is an amenable number.

5219205721 is a deficient number, since it is larger than the sum of its proper divisors (32019831).

5219205721 is a wasteful number, since it uses less digits than its factorization.

5219205721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32019830.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 5219205721 is about 72244.0704902485. The cubic root of 5219205721 is about 1734.6085063745.

The spelling of 5219205721 in words is "five billion, two hundred nineteen million, two hundred five thousand, seven hundred twenty-one".