21434222155457 has 2 divisors, whose sum is σ = 21434222155458. Its totient is φ = 21434222155456.

The previous prime is 21434222155427. The next prime is 21434222155459. The reversal of 21434222155457 is 75455122243412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21157387280656 + 276834874801 = 4599716^2 + 526151^2 .

It is a cyclic number.

It is not a de Polignac number, because 21434222155457 - 2⁸ = 21434222155201 is a prime.

It is a super-5 number, since 5×21434222155457⁵ (a number of 68 digits) contains 55555 as substring.

Together with 21434222155459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21434222155459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717111077728 + 10717111077729.

It is an arithmetic number, because the mean of its divisors is an integer number (10717111077729).

Almost surely, 2^{21434222155457} is an apocalyptic number.

It is an amenable number.

21434222155457 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434222155457 is an equidigital number, since it uses as much as digits as its factorization.

21434222155457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688000, while the sum is 47.

Adding to 21434222155457 its reverse (75455122243412), we get a palindrome (96889344398869).

The spelling of 21434222155457 in words is "twenty-one trillion, four hundred thirty-four billion, two hundred twenty-two million, one hundred fifty-five thousand, four hundred fifty-seven".