1031213121311 has 4 divisors (see below), whose sum is σ = 1032466114992. Its totient is φ = 1029960127632.

The previous prime is 1031213121287. The next prime is 1031213121347. The reversal of 1031213121311 is 1131213121301.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031213121311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031213124311) 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, 626495606 + ... + 626497251.

It is an arithmetic number, because the mean of its divisors is an integer number (258116528748).

Almost surely, 2^{1031213121311} is an apocalyptic number.

1031213121311 is a deficient number, since it is larger than the sum of its proper divisors (1252993681).

1031213121311 is an equidigital number, since it uses as much as digits as its factorization.

1031213121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252993680.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 1031213121311 its reverse (1131213121301), we get a palindrome (2162426242612).

The spelling of 1031213121311 in words is "one trillion, thirty-one billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred eleven".