213150221 has 2 divisors, whose sum is σ = 213150222. Its totient is φ = 213150220.

The previous prime is 213150211. The next prime is 213150239. The reversal of 213150221 is 122051312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197262025 + 15888196 = 14045^2 + 3986^2 .

It is a cyclic number.

It is not a de Polignac number, because 213150221 - 2¹⁰ = 213149197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213150221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213150211) 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, 106575110 + 106575111.

It is an arithmetic number, because the mean of its divisors is an integer number (106575111).

Almost surely, 2^213150221 is an apocalyptic number.

It is an amenable number.

213150221 is a deficient number, since it is larger than the sum of its proper divisors (1).

213150221 is an equidigital number, since it uses as much as digits as its factorization.

213150221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 213150221 is about 14599.6650988987. The cubic root of 213150221 is about 597.3496255042.

The spelling of 213150221 in words is "two hundred thirteen million, one hundred fifty thousand, two hundred twenty-one".