1210231321 has 4 divisors (see below), whose sum is σ = 1303326052. Its totient is φ = 1117136592.

The previous prime is 1210231301. The next prime is 1210231331. The reversal of 1210231321 is 1231320121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231320121 = 193 ⋅6379897.

It can be written as a sum of positive squares in 2 ways, for example, as 93334921 + 1116896400 = 9661^2 + 33420^2 .

It is not a de Polignac number, because 1210231321 - 2¹³ = 1210223129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210231295 and 1210231304.

It is not an unprimeable number, because it can be changed into a prime (1210231301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46547346 + ... + 46547371.

It is an arithmetic number, because the mean of its divisors is an integer number (325831513).

Almost surely, 2^1210231321 is an apocalyptic number.

It is an amenable number.

1210231321 is a deficient number, since it is larger than the sum of its proper divisors (93094731).

1210231321 is an equidigital number, since it uses as much as digits as its factorization.

1210231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93094730.

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

The square root of 1210231321 is about 34788.3791085472. The cubic root of 1210231321 is about 1065.6701377222.

Adding to 1210231321 its reverse (1231320121), we get a palindrome (2441551442).

The spelling of 1210231321 in words is "one billion, two hundred ten million, two hundred thirty-one thousand, three hundred twenty-one".