21220213213337 has 2 divisors, whose sum is σ = 21220213213338. Its totient is φ = 21220213213336.

The previous prime is 21220213213307. The next prime is 21220213213357. The reversal of 21220213213337 is 73331231202212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19234399575616 + 1985813637721 = 4385704^2 + 1409189^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220213213337 - 2²⁴ = 21220196436121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220213213307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610106606668 + 10610106606669.

It is an arithmetic number, because the mean of its divisors is an integer number (10610106606669).

Almost surely, 2^{21220213213337} is an apocalyptic number.

It is an amenable number.

21220213213337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220213213337 is an equidigital number, since it uses as much as digits as its factorization.

21220213213337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

Adding to 21220213213337 its reverse (73331231202212), we get a palindrome (94551444415549).

The spelling of 21220213213337 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirteen million, two hundred thirteen thousand, three hundred thirty-seven".