1031223221 has 4 divisors (see below), whose sum is σ = 1178540832. Its totient is φ = 883905612.

The previous prime is 1031223217. The next prime is 1031223227. The reversal of 1031223221 is 1223221301.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1223221301 = 43 ⋅28447007.

It is a cyclic number.

It is not a de Polignac number, because 1031223221 - 2² = 1031223217 is a prime.

It is a super-2 number, since 2×1031223221² = 2126842663059229682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1031223221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031223227) 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, 73658795 + ... + 73658808.

It is an arithmetic number, because the mean of its divisors is an integer number (294635208).

Almost surely, 2^1031223221 is an apocalyptic number.

It is an amenable number.

1031223221 is a deficient number, since it is larger than the sum of its proper divisors (147317611).

1031223221 is an equidigital number, since it uses as much as digits as its factorization.

1031223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147317610.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1031223221 is about 32112.6644954915. The cubic root of 1031223221 is about 1010.3012599997.

Adding to 1031223221 its reverse (1223221301), we get a palindrome (2254444522).

It can be divided in two parts, 10312 and 23221, that added together give a palindrome (33533).

The spelling of 1031223221 in words is "one billion, thirty-one million, two hundred twenty-three thousand, two hundred twenty-one".