212707521 has 12 divisors (see below), whose sum is σ = 330878548. Its totient is φ = 130896864.

The previous prime is 212707511. The next prime is 212707531. The reversal of 212707521 is 125707212.

It is an interprime number because it is at equal distance from previous prime (212707511) and next prime (212707531).

It can be written as a sum of positive squares in 2 ways, for example, as 68707521 + 144000000 = 8289^2 + 12000^2 .

It is not a de Polignac number, because 212707521 - 2⁶ = 212707457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212707501) 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 in 11 ways as a sum of consecutive naturals, for example, 908890 + ... + 909123.

Almost surely, 2^212707521 is an apocalyptic number.

It is an amenable number.

212707521 is a deficient number, since it is larger than the sum of its proper divisors (118171027).

212707521 is a wasteful number, since it uses less digits than its factorization.

212707521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818032 (or 1818029 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 212707521 is about 14584.4959117551. The cubic root of 212707521 is about 596.9357859605.

The spelling of 212707521 in words is "two hundred twelve million, seven hundred seven thousand, five hundred twenty-one".