1031323440221 has 4 divisors (see below), whose sum is σ = 1066886317500. Its totient is φ = 995760562944.

The previous prime is 1031323440137. The next prime is 1031323440229. The reversal of 1031323440221 is 1220443231301.

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 614046199321 + 417277240900 = 783611^2 + 645970^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1031323440221 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 (1031323440229) 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, 17781438596 + ... + 17781438653.

It is an arithmetic number, because the mean of its divisors is an integer number (266721579375).

Almost surely, 2^{1031323440221} is an apocalyptic number.

It is an amenable number.

1031323440221 is a deficient number, since it is larger than the sum of its proper divisors (35562877279).

1031323440221 is an equidigital number, since it uses as much as digits as its factorization.

1031323440221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35562877278.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1031323440221 its reverse (1220443231301), we get a palindrome (2251766671522).

The spelling of 1031323440221 in words is "one trillion, thirty-one billion, three hundred twenty-three million, four hundred forty thousand, two hundred twenty-one".