2721813239 has 2 divisors, whose sum is σ = 2721813240. Its totient is φ = 2721813238.

The previous prime is 2721813223. The next prime is 2721813253. The reversal of 2721813239 is 9323181272.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2721813239 - 2⁴ = 2721813223 is a prime.

It is a super-2 number, since 2×2721813239² = 14816534615991342242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2721813139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360906619 + 1360906620.

It is an arithmetic number, because the mean of its divisors is an integer number (1360906620).

Almost surely, 2^2721813239 is an apocalyptic number.

2721813239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721813239 is an equidigital number, since it uses as much as digits as its factorization.

2721813239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 2721813239 is about 52170.9999808323. Note that the first 4 decimals coincide. The cubic root of 2721813239 is about 1396.2165257678.

The spelling of 2721813239 in words is "two billion, seven hundred twenty-one million, eight hundred thirteen thousand, two hundred thirty-nine".