5215804721 has 2 divisors, whose sum is σ = 5215804722. Its totient is φ = 5215804720.

The previous prime is 5215804681. The next prime is 5215804729. The reversal of 5215804721 is 1274085125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5209230625 + 6574096 = 72175^2 + 2564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5215804721 is a prime.

It is not a weakly prime, because it can be changed into another prime (5215804729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2607902360 + 2607902361.

It is an arithmetic number, because the mean of its divisors is an integer number (2607902361).

Almost surely, 2^5215804721 is an apocalyptic number.

It is an amenable number.

5215804721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5215804721 is an equidigital number, since it uses as much as digits as its factorization.

5215804721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 5215804721 is about 72220.5283904791. The cubic root of 5215804721 is about 1734.2316491973.

Adding to 5215804721 its reverse (1274085125), we get a palindrome (6489889846).

The spelling of 5215804721 in words is "five billion, two hundred fifteen million, eight hundred four thousand, seven hundred twenty-one".