21223425563 has 2 divisors, whose sum is σ = 21223425564. Its totient is φ = 21223425562.

The previous prime is 21223425557. The next prime is 21223425611. The reversal of 21223425563 is 36552432212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223425563 - 2⁴ = 21223425547 is a prime.

It is not a weakly prime, because it can be changed into another prime (21223425263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611712781 + 10611712782.

It is an arithmetic number, because the mean of its divisors is an integer number (10611712782).

Almost surely, 2^21223425563 is an apocalyptic number.

21223425563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223425563 is an equidigital number, since it uses as much as digits as its factorization.

21223425563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 35.

Adding to 21223425563 its reverse (36552432212), we get a palindrome (57775857775).

The spelling of 21223425563 in words is "twenty-one billion, two hundred twenty-three million, four hundred twenty-five thousand, five hundred sixty-three".