1012215221 has 2 divisors, whose sum is σ = 1012215222. Its totient is φ = 1012215220.

The previous prime is 1012215209. The next prime is 1012215247. The reversal of 1012215221 is 1225122101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 992943121 + 19272100 = 31511^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012215221 - 2⁶ = 1012215157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1012215221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012215271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506107610 + 506107611.

It is an arithmetic number, because the mean of its divisors is an integer number (506107611).

Almost surely, 2^1012215221 is an apocalyptic number.

It is an amenable number.

1012215221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012215221 is an equidigital number, since it uses as much as digits as its factorization.

1012215221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1012215221 is about 31815.3299684287. The cubic root of 1012215221 is about 1004.0552728653.

Adding to 1012215221 its reverse (1225122101), we get a palindrome (2237337322).

The spelling of 1012215221 in words is "one billion, twelve million, two hundred fifteen thousand, two hundred twenty-one".