1221113344031 has 4 divisors (see below), whose sum is σ = 1395558107472. Its totient is φ = 1046668580592.

The previous prime is 1221113343991. The next prime is 1221113344037. The reversal of 1221113344031 is 1304433111221.

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-1221113344031 is a prime.

It is a super-2 number, since 2×1221113344031² (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 (1221113344037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87222381710 + ... + 87222381723.

It is an arithmetic number, because the mean of its divisors is an integer number (348889526868).

Almost surely, 2^{1221113344031} is an apocalyptic number.

1221113344031 is a deficient number, since it is larger than the sum of its proper divisors (174444763441).

1221113344031 is an equidigital number, since it uses as much as digits as its factorization.

1221113344031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174444763440.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1221113344031 its reverse (1304433111221), we get a palindrome (2525546455252).

The spelling of 1221113344031 in words is "one trillion, two hundred twenty-one billion, one hundred thirteen million, three hundred forty-four thousand, thirty-one".