211313521 has 2 divisors, whose sum is σ = 211313522. Its totient is φ = 211313520.

The previous prime is 211313507. The next prime is 211313533. The reversal of 211313521 is 125313112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211295296 + 18225 = 14536^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 211313521 - 2⁷ = 211313393 is a prime.

It is not a weakly prime, because it can be changed into another prime (211313021) 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, 105656760 + 105656761.

It is an arithmetic number, because the mean of its divisors is an integer number (105656761).

Almost surely, 2^211313521 is an apocalyptic number.

It is an amenable number.

211313521 is a deficient number, since it is larger than the sum of its proper divisors (1).

211313521 is an equidigital number, since it uses as much as digits as its factorization.

211313521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 19.

The square root of 211313521 is about 14536.6268783374. The cubic root of 211313521 is about 595.6289007414.

Adding to 211313521 its reverse (125313112), we get a palindrome (336626633).

The spelling of 211313521 in words is "two hundred eleven million, three hundred thirteen thousand, five hundred twenty-one".