1010031221 has 4 divisors (see below), whose sum is σ = 1020444012. Its totient is φ = 999618432.

The previous prime is 1010031199. The next prime is 1010031289. The reversal of 1010031221 is 1221300101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 805140625 + 204890596 = 28375^2 + 14314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1010031221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010031521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5206250 + ... + 5206443.

It is an arithmetic number, because the mean of its divisors is an integer number (255111003).

Almost surely, 2^1010031221 is an apocalyptic number.

It is an amenable number.

1010031221 is a deficient number, since it is larger than the sum of its proper divisors (10412791).

1010031221 is an equidigital number, since it uses as much as digits as its factorization.

1010031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10412790.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1010031221 is about 31780.9883578217. The cubic root of 1010031221 is about 1003.3326216286.

Adding to 1010031221 its reverse (1221300101), we get a palindrome (2231331322).

The spelling of 1010031221 in words is "one billion, ten million, thirty-one thousand, two hundred twenty-one".