1012031221 has 2 divisors, whose sum is σ = 1012031222. Its totient is φ = 1012031220.

The previous prime is 1012031197. The next prime is 1012031227. The reversal of 1012031221 is 1221302101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971568900 + 40462321 = 31170^2 + 6361^2 .

It is an emirp because it is prime and its reverse (1221302101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012031221 - 2⁷ = 1012031093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012031227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506015610 + 506015611.

It is an arithmetic number, because the mean of its divisors is an integer number (506015611).

Almost surely, 2^1012031221 is an apocalyptic number.

It is an amenable number.

1012031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012031221 is an equidigital number, since it uses as much as digits as its factorization.

1012031221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1012031221 is about 31812.4381492523. The cubic root of 1012031221 is about 1003.9944302824.

Adding to 1012031221 its reverse (1221302101), we get a palindrome (2233333322).

The spelling of 1012031221 in words is "one billion, twelve million, thirty-one thousand, two hundred twenty-one".