1031213111221 has 4 divisors (see below), whose sum is σ = 1031238868000. Its totient is φ = 1031187354444.

The previous prime is 1031213111197. The next prime is 1031213111239. The reversal of 1031213111221 is 1221113121301.

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 a cyclic number.

It is not a de Polignac number, because 1031213111221 - 2²⁵ = 1031179556789 is a prime.

It is a super-2 number, since 2×1031213111221² (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 (1031213111261) 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, 12818241 + ... + 12898438.

It is an arithmetic number, because the mean of its divisors is an integer number (257809717000).

Almost surely, 2^{1031213111221} is an apocalyptic number.

It is an amenable number.

1031213111221 is a deficient number, since it is larger than the sum of its proper divisors (25756779).

1031213111221 is an equidigital number, since it uses as much as digits as its factorization.

1031213111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25756778.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1031213111221 its reverse (1221113121301), we get a palindrome (2252326232522).

The spelling of 1031213111221 in words is "one trillion, thirty-one billion, two hundred thirteen million, one hundred eleven thousand, two hundred twenty-one".