21535963883 has 12 divisors (see below), whose sum is σ = 25476653880. Its totient is φ = 18146524032.

The previous prime is 21535963861. The next prime is 21535963907. The reversal of 21535963883 is 38836953512.

It is not a de Polignac number, because 21535963883 - 2²⁶ = 21468855019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21535963843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3721766 + ... + 3727547.

It is an arithmetic number, because the mean of its divisors is an integer number (2123054490).

Almost surely, 2^21535963883 is an apocalyptic number.

21535963883 is a deficient number, since it is larger than the sum of its proper divisors (3940689997).

21535963883 is an equidigital number, since it uses as much as digits as its factorization.

21535963883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7449386 (or 7449379 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 53.

The spelling of 21535963883 in words is "twenty-one billion, five hundred thirty-five million, nine hundred sixty-three thousand, eight hundred eighty-three".