21425214533 has 2 divisors, whose sum is σ = 21425214534. Its totient is φ = 21425214532.

The previous prime is 21425214527. The next prime is 21425214553. The reversal of 21425214533 is 33541252412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17293039009 + 4132175524 = 131503^2 + 64282^2 .

It is a cyclic number.

It is not a de Polignac number, because 21425214533 - 2⁸ = 21425214277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21425214533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21425214553) 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, 10712607266 + 10712607267.

It is an arithmetic number, because the mean of its divisors is an integer number (10712607267).

Almost surely, 2^21425214533 is an apocalyptic number.

It is an amenable number.

21425214533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425214533 is an equidigital number, since it uses as much as digits as its factorization.

21425214533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 32.

Adding to 21425214533 its reverse (33541252412), we get a palindrome (54966466945).

The spelling of 21425214533 in words is "twenty-one billion, four hundred twenty-five million, two hundred fourteen thousand, five hundred thirty-three".