1210031231321 has 4 divisors (see below), whose sum is σ = 1320034070544. Its totient is φ = 1100028392100.

The previous prime is 1210031231303. The next prime is 1210031231371. The reversal of 1210031231321 is 1231321300121.

It is a happy number.

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 not a de Polignac number, because 1210031231321 - 2¹⁰ = 1210031230297 is a prime.

It is a super-2 number, since 2×1210031231321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210031231293 and 1210031231302.

It is not an unprimeable number, because it can be changed into a prime (1210031231371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55001419595 + ... + 55001419616.

It is an arithmetic number, because the mean of its divisors is an integer number (330008517636).

Almost surely, 2^{1210031231321} is an apocalyptic number.

1210031231321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210031231321 is a deficient number, since it is larger than the sum of its proper divisors (110002839223).

1210031231321 is a wasteful number, since it uses less digits than its factorization.

1210031231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110002839222.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1210031231321 its reverse (1231321300121), we get a palindrome (2441352531442).

The spelling of 1210031231321 in words is "one trillion, two hundred ten billion, thirty-one million, two hundred thirty-one thousand, three hundred twenty-one".