211324721 has 2 divisors, whose sum is σ = 211324722. Its totient is φ = 211324720.

The previous prime is 211324717. The next prime is 211324777. The reversal of 211324721 is 127423112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160402225 + 50922496 = 12665^2 + 7136^2 .

It is a cyclic number.

It is not a de Polignac number, because 211324721 - 2² = 211324717 is a prime.

It is not a weakly prime, because it can be changed into another prime (211324021) 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, 105662360 + 105662361.

It is an arithmetic number, because the mean of its divisors is an integer number (105662361).

Almost surely, 2^211324721 is an apocalyptic number.

It is an amenable number.

211324721 is a deficient number, since it is larger than the sum of its proper divisors (1).

211324721 is an equidigital number, since it uses as much as digits as its factorization.

211324721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 211324721 is about 14537.0121070322. The cubic root of 211324721 is about 595.6394236930.

Adding to 211324721 its reverse (127423112), we get a palindrome (338747833).

The spelling of 211324721 in words is "two hundred eleven million, three hundred twenty-four thousand, seven hundred twenty-one".