21224352334321 has 2 divisors, whose sum is σ = 21224352334322. Its totient is φ = 21224352334320.

The previous prime is 21224352334301. The next prime is 21224352334357. The reversal of 21224352334321 is 12343325342212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13000993164721 + 8223359169600 = 3605689^2 + 2867640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21224352334321 - 2⁷ = 21224352334193 is a prime.

It is a super-2 number, since 2×21224352334321² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21224352334301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612176167160 + 10612176167161.

It is an arithmetic number, because the mean of its divisors is an integer number (10612176167161).

Almost surely, 2^{21224352334321} is an apocalyptic number.

It is an amenable number.

21224352334321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224352334321 is an equidigital number, since it uses as much as digits as its factorization.

21224352334321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 37.

Adding to 21224352334321 its reverse (12343325342212), we get a palindrome (33567677676533).

The spelling of 21224352334321 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred fifty-two million, three hundred thirty-four thousand, three hundred twenty-one".