21222052413643 has 2 divisors, whose sum is σ = 21222052413644. Its totient is φ = 21222052413642.

The previous prime is 21222052413629. The next prime is 21222052413647. The reversal of 21222052413643 is 34631425022212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222052413643 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222052413647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611026206821 + 10611026206822.

It is an arithmetic number, because the mean of its divisors is an integer number (10611026206822).

Almost surely, 2^{21222052413643} is an apocalyptic number.

21222052413643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222052413643 is an equidigital number, since it uses as much as digits as its factorization.

21222052413643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 21222052413643 its reverse (34631425022212), we get a palindrome (55853477435855).

The spelling of 21222052413643 in words is "twenty-one trillion, two hundred twenty-two billion, fifty-two million, four hundred thirteen thousand, six hundred forty-three".