21235427563 has 8 divisors (see below), whose sum is σ = 24270801120. Its totient is φ = 18200489280.

The previous prime is 21235427531. The next prime is 21235427581. The reversal of 21235427563 is 36572453212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21235427563 - 2⁵ = 21235427531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21235427593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3453 + ... + 206113.

It is an arithmetic number, because the mean of its divisors is an integer number (3033850140).

Almost surely, 2^21235427563 is an apocalyptic number.

21235427563 is a deficient number, since it is larger than the sum of its proper divisors (3035373557).

21235427563 is a wasteful number, since it uses less digits than its factorization.

21235427563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217637.

The product of its digits is 302400, while the sum is 40.

The spelling of 21235427563 in words is "twenty-one billion, two hundred thirty-five million, four hundred twenty-seven thousand, five hundred sixty-three".