5213943821 has 2 divisors, whose sum is σ = 5213943822. Its totient is φ = 5213943820.

The previous prime is 5213943799. The next prime is 5213943857. The reversal of 5213943821 is 1283493125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5042988196 + 170955625 = 71014^2 + 13075^2 .

It is a cyclic number.

It is not a de Polignac number, because 5213943821 - 2¹⁴ = 5213927437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5213943421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2606971910 + 2606971911.

It is an arithmetic number, because the mean of its divisors is an integer number (2606971911).

Almost surely, 2^5213943821 is an apocalyptic number.

It is an amenable number.

5213943821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5213943821 is an equidigital number, since it uses as much as digits as its factorization.

5213943821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 5213943821 is about 72207.6437851285. The cubic root of 5213943821 is about 1734.0253776994.

The spelling of 5213943821 in words is "five billion, two hundred thirteen million, nine hundred forty-three thousand, eight hundred twenty-one".