1311022221031 has 4 divisors (see below), whose sum is σ = 1320591726432. Its totient is φ = 1301452715632.

The previous prime is 1311022221001. The next prime is 1311022221133. The reversal of 1311022221031 is 1301222201131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311022221031 - 2¹⁵ = 1311022188263 is a prime.

It is a super-2 number, since 2×1311022221031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311022221001) 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, 4784752495 + ... + 4784752768.

It is an arithmetic number, because the mean of its divisors is an integer number (330147931608).

Almost surely, 2^{1311022221031} is an apocalyptic number.

1311022221031 is a deficient number, since it is larger than the sum of its proper divisors (9569505401).

1311022221031 is an equidigital number, since it uses as much as digits as its factorization.

1311022221031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9569505400.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1311022221031 its reverse (1301222201131), we get a palindrome (2612244422162).

The spelling of 1311022221031 in words is "one trillion, three hundred eleven billion, twenty-two million, two hundred twenty-one thousand, thirty-one".