21222112021013 has 2 divisors, whose sum is σ = 21222112021014. Its totient is φ = 21222112021012.

The previous prime is 21222112020983. The next prime is 21222112021051. The reversal of 21222112021013 is 31012021122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21069357678769 + 152754342244 = 4590137^2 + 390838^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222112021013 - 2¹⁴ = 21222112004629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222112021213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611056010506 + 10611056010507.

It is an arithmetic number, because the mean of its divisors is an integer number (10611056010507).

Almost surely, 2^{21222112021013} is an apocalyptic number.

It is an amenable number.

21222112021013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222112021013 is an equidigital number, since it uses as much as digits as its factorization.

21222112021013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21222112021013 its reverse (31012021122212), we get a palindrome (52234133143225).

The spelling of 21222112021013 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, twenty-one thousand, thirteen".