1031231132221 has 4 divisors (see below), whose sum is σ = 1034953988572. Its totient is φ = 1027508275872.

The previous prime is 1031231132213. The next prime is 1031231132233. The reversal of 1031231132221 is 1222311321301.

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 181126848100 + 850104284121 = 425590^2 + 922011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031231132221 - 2³ = 1031231132213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031231132192 and 1031231132201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031231132201) 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, 1861427760 + ... + 1861428313.

It is an arithmetic number, because the mean of its divisors is an integer number (258738497143).

Almost surely, 2^{1031231132221} is an apocalyptic number.

It is an amenable number.

1031231132221 is a deficient number, since it is larger than the sum of its proper divisors (3722856351).

1031231132221 is an equidigital number, since it uses as much as digits as its factorization.

1031231132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722856350.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1031231132221 its reverse (1222311321301), we get a palindrome (2253542453522).

The spelling of 1031231132221 in words is "one trillion, thirty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, two hundred twenty-one".