21325193563 has 2 divisors, whose sum is σ = 21325193564. Its totient is φ = 21325193562.

The previous prime is 21325193543. The next prime is 21325193597. The reversal of 21325193563 is 36539152312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21325193563 - 2⁹ = 21325193051 is a prime.

It is a super-3 number, since 3×21325193563³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21325193503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662596781 + 10662596782.

It is an arithmetic number, because the mean of its divisors is an integer number (10662596782).

Almost surely, 2^21325193563 is an apocalyptic number.

21325193563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325193563 is an equidigital number, since it uses as much as digits as its factorization.

21325193563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 40.

The spelling of 21325193563 in words is "twenty-one billion, three hundred twenty-five million, one hundred ninety-three thousand, five hundred sixty-three".