21222111020237 has 2 divisors, whose sum is σ = 21222111020238. Its totient is φ = 21222111020236.

The previous prime is 21222111020207. The next prime is 21222111020239. The reversal of 21222111020237 is 73202011122212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15305473152841 + 5916637867396 = 3912221^2 + 2432414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222111020237 is a prime.

Together with 21222111020239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222111020239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611055510118 + 10611055510119.

It is an arithmetic number, because the mean of its divisors is an integer number (10611055510119).

Almost surely, 2^{21222111020237} is an apocalyptic number.

It is an amenable number.

21222111020237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222111020237 is an equidigital number, since it uses as much as digits as its factorization.

21222111020237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21222111020237 its reverse (73202011122212), we get a palindrome (94424122142449).

The spelling of 21222111020237 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, twenty thousand, two hundred thirty-seven".