1231123203221 has 8 divisors (see below), whose sum is σ = 1275392547000. Its totient is φ = 1186974980800.

The previous prime is 1231123203217. The next prime is 1231123203259. The reversal of 1231123203221 is 1223023211321.

It can be written as a sum of positive squares in 4 ways, for example, as 348442284100 + 882680919121 = 590290^2 + 939511^2 .

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 1231123203221 - 2² = 1231123203217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231123203281) 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, 30259646 + ... + 30300303.

It is an arithmetic number, because the mean of its divisors is an integer number (159424068375).

Almost surely, 2^{1231123203221} is an apocalyptic number.

It is an amenable number.

1231123203221 is a deficient number, since it is larger than the sum of its proper divisors (44269343779).

1231123203221 is an equidigital number, since it uses as much as digits as its factorization.

1231123203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60560679.

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

Adding to 1231123203221 its reverse (1223023211321), we get a palindrome (2454146414542).

The spelling of 1231123203221 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, two hundred three thousand, two hundred twenty-one".