2721999139 has 2 divisors, whose sum is σ = 2721999140. Its totient is φ = 2721999138.

The previous prime is 2721999083. The next prime is 2721999167. The reversal of 2721999139 is 9319991272.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2721999139 - 2⁷ = 2721999011 is a prime.

It is not a weakly prime, because it can be changed into another prime (2721999169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360999569 + 1360999570.

It is an arithmetic number, because the mean of its divisors is an integer number (1360999570).

Almost surely, 2^2721999139 is an apocalyptic number.

2721999139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721999139 is an equidigital number, since it uses as much as digits as its factorization.

2721999139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 52.

The square root of 2721999139 is about 52172.7815915540. The cubic root of 2721999139 is about 1396.2483122670.

The spelling of 2721999139 in words is "two billion, seven hundred twenty-one million, nine hundred ninety-nine thousand, one hundred thirty-nine".