21242243452433 has 2 divisors, whose sum is σ = 21242243452434. Its totient is φ = 21242243452432.

The previous prime is 21242243452421. The next prime is 21242243452543. The reversal of 21242243452433 is 33425434224212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14628047063569 + 6614196388864 = 3824663^2 + 2571808^2 .

It is a cyclic number.

It is not a de Polignac number, because 21242243452433 - 2¹⁴ = 21242243436049 is a prime.

It is a super-4 number, since 4×21242243452433⁴ (a number of 54 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21242243452733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621121726216 + 10621121726217.

It is an arithmetic number, because the mean of its divisors is an integer number (10621121726217).

Almost surely, 2^{21242243452433} is an apocalyptic number.

It is an amenable number.

21242243452433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21242243452433 is an equidigital number, since it uses as much as digits as its factorization.

21242243452433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1105920, while the sum is 41.

Adding to 21242243452433 its reverse (33425434224212), we get a palindrome (54667677676645).

The spelling of 21242243452433 in words is "twenty-one trillion, two hundred forty-two billion, two hundred forty-three million, four hundred fifty-two thousand, four hundred thirty-three".