2721247 has 2 divisors, whose sum is σ = 2721248. Its totient is φ = 2721246.

The previous prime is 2721227. The next prime is 2721259. The reversal of 2721247 is 7421272.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2721247 - 2⁷ = 2721119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2721227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360623 + 1360624.

It is an arithmetic number, because the mean of its divisors is an integer number (1360624).

2^2721247 is an apocalyptic number.

2721247 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721247 is an equidigital number, since it uses as much as digits as its factorization.

2721247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 25.

The square root of 2721247 is about 1649.6202593324. The cubic root of 2721247 is about 139.6119697292.

Adding to 2721247 its sum of digits (25), we get a palindrome (2721272).

The spelling of 2721247 in words is "two million, seven hundred twenty-one thousand, two hundred forty-seven".