21234433124257 has 2 divisors, whose sum is σ = 21234433124258. Its totient is φ = 21234433124256.

The previous prime is 21234433124251. The next prime is 21234433124309. The reversal of 21234433124257 is 75242133443212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15626019256576 + 5608413867681 = 3952976^2 + 2368209^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234433124257 - 2³ = 21234433124249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21234433124251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617216562128 + 10617216562129.

It is an arithmetic number, because the mean of its divisors is an integer number (10617216562129).

Almost surely, 2^{21234433124257} is an apocalyptic number.

It is an amenable number.

21234433124257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234433124257 is an equidigital number, since it uses as much as digits as its factorization.

21234433124257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 43.

Adding to 21234433124257 its reverse (75242133443212), we get a palindrome (96476566567469).

The spelling of 21234433124257 in words is "twenty-one trillion, two hundred thirty-four billion, four hundred thirty-three million, one hundred twenty-four thousand, two hundred fifty-seven".