21220213213313 has 4 divisors (see below), whose sum is σ = 21302782136580. Its totient is φ = 21137644290048.

The previous prime is 21220213213307. The next prime is 21220213213337. The reversal of 21220213213313 is 31331231202212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20778755290384 + 441457922929 = 4558372^2 + 664423^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220213213313 - 2³⁸ = 20945335306369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220213213363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41284461248 + ... + 41284461761.

It is an arithmetic number, because the mean of its divisors is an integer number (5325695534145).

Almost surely, 2^{21220213213313} is an apocalyptic number.

It is an amenable number.

21220213213313 is a deficient number, since it is larger than the sum of its proper divisors (82568923267).

21220213213313 is an equidigital number, since it uses as much as digits as its factorization.

21220213213313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82568923266.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21220213213313 its reverse (31331231202212), we get a palindrome (52551444415525).

The spelling of 21220213213313 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirteen million, two hundred thirteen thousand, three hundred thirteen".