1031231221 has 8 divisors (see below), whose sum is σ = 1056888000. Its totient is φ = 1005598560.

The previous prime is 1031231209. The next prime is 1031231239. The reversal of 1031231221 is 1221321301.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1031231221 - 2⁵ = 1031231189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031231195 and 1031231204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031231521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106000 + ... + 115318.

It is an arithmetic number, because the mean of its divisors is an integer number (132111000).

Almost surely, 2^1031231221 is an apocalyptic number.

It is an amenable number.

1031231221 is a deficient number, since it is larger than the sum of its proper divisors (25656779).

1031231221 is an equidigital number, since it uses as much as digits as its factorization.

1031231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12059.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1031231221 is about 32112.7890566983. The cubic root of 1031231221 is about 1010.3038725570.

Adding to 1031231221 its reverse (1221321301), we get a palindrome (2252552522).

The spelling of 1031231221 in words is "one billion, thirty-one million, two hundred thirty-one thousand, two hundred twenty-one".