1031223231221 has 4 divisors (see below), whose sum is σ = 1033029226944. Its totient is φ = 1029417235500.

The previous prime is 1031223231191. The next prime is 1031223231251. The reversal of 1031223231221 is 1221323221301.

1031223231221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is an interprime number because it is at equal distance from previous prime (1031223231191) and next prime (1031223231251).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031223231221 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 (1031223231251) 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, 902997005 + ... + 902998146.

It is an arithmetic number, because the mean of its divisors is an integer number (258257306736).

Almost surely, 2^{1031223231221} is an apocalyptic number.

It is an amenable number.

1031223231221 is a deficient number, since it is larger than the sum of its proper divisors (1805995723).

1031223231221 is an equidigital number, since it uses as much as digits as its factorization.

1031223231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805995722.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1031223231221 its reverse (1221323221301), we get a palindrome (2252546452522).

The spelling of 1031223231221 in words is "one trillion, thirty-one billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty-one".