273722021 has 2 divisors, whose sum is σ = 273722022. Its totient is φ = 273722020.

The previous prime is 273721979. The next prime is 273722087. The reversal of 273722021 is 120227372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260661025 + 13060996 = 16145^2 + 3614^2 .

It is a cyclic number.

It is not a de Polignac number, because 273722021 - 2¹⁸ = 273459877 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (273722621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136861010 + 136861011.

It is an arithmetic number, because the mean of its divisors is an integer number (136861011).

Almost surely, 2^273722021 is an apocalyptic number.

It is an amenable number.

273722021 is a deficient number, since it is larger than the sum of its proper divisors (1).

273722021 is an equidigital number, since it uses as much as digits as its factorization.

273722021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 273722021 is about 16544.5465637472. The cubic root of 273722021 is about 649.2868082920.

Adding to 273722021 its reverse (120227372), we get a palindrome (393949393).

The spelling of 273722021 in words is "two hundred seventy-three million, seven hundred twenty-two thousand, twenty-one".