21201221012233 has 2 divisors, whose sum is σ = 21201221012234. Its totient is φ = 21201221012232.

The previous prime is 21201221012071. The next prime is 21201221012273. The reversal of 21201221012233 is 33221012210212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20420881988809 + 780339023424 = 4518947^2 + 883368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201221012233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201221012273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600610506116 + 10600610506117.

It is an arithmetic number, because the mean of its divisors is an integer number (10600610506117).

Almost surely, 2^{21201221012233} is an apocalyptic number.

It is an amenable number.

21201221012233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201221012233 is an equidigital number, since it uses as much as digits as its factorization.

21201221012233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21201221012233 its reverse (33221012210212), we get a palindrome (54422233222445).

The spelling of 21201221012233 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-one million, twelve thousand, two hundred thirty-three".