21223356337 has 2 divisors, whose sum is σ = 21223356338. Its totient is φ = 21223356336.

The previous prime is 21223356313. The next prime is 21223356347. The reversal of 21223356337 is 73365332212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21008763136 + 214593201 = 144944^2 + 14649^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223356337 - 2²³ = 21214967729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223356296 and 21223356305.

It is not a weakly prime, because it can be changed into another prime (21223356347) 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 as a sum of consecutive naturals, namely, 10611678168 + 10611678169.

It is an arithmetic number, because the mean of its divisors is an integer number (10611678169).

Almost surely, 2^21223356337 is an apocalyptic number.

It is an amenable number.

21223356337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223356337 is an equidigital number, since it uses as much as digits as its factorization.

21223356337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 37.

Adding to 21223356337 its reverse (73365332212), we get a palindrome (94588688549).

The spelling of 21223356337 in words is "twenty-one billion, two hundred twenty-three million, three hundred fifty-six thousand, three hundred thirty-seven".