1313221213021 has 2 divisors, whose sum is σ = 1313221213022. Its totient is φ = 1313221213020.

The previous prime is 1313221213009. The next prime is 1313221213091. The reversal of 1313221213021 is 1203121223131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1275682150521 + 37539062500 = 1129461^2 + 193750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313221213021 - 2⁷ = 1313221212893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1313221212983 and 1313221213001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313221213091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656610606510 + 656610606511.

It is an arithmetic number, because the mean of its divisors is an integer number (656610606511).

Almost surely, 2^{1313221213021} is an apocalyptic number.

It is an amenable number.

1313221213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313221213021 is an equidigital number, since it uses as much as digits as its factorization.

1313221213021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1313221213021 its reverse (1203121223131), we get a palindrome (2516342436152).

The spelling of 1313221213021 in words is "one trillion, three hundred thirteen billion, two hundred twenty-one million, two hundred thirteen thousand, twenty-one".