21235222463 has 12 divisors (see below), whose sum is σ = 26602367400. Its totient is φ = 16801494192.

The previous prime is 21235222457. The next prime is 21235222471. The reversal of 21235222463 is 36422253212.

It is not a de Polignac number, because 21235222463 - 2²⁰ = 21234173887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235222403) 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, 16667513 + ... + 16668786.

It is an arithmetic number, because the mean of its divisors is an integer number (2216863950).

Almost surely, 2^21235222463 is an apocalyptic number.

21235222463 is a deficient number, since it is larger than the sum of its proper divisors (5367144937).

21235222463 is a wasteful number, since it uses less digits than its factorization.

21235222463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33336326 (or 33336319 counting only the distinct ones).

The product of its digits is 34560, while the sum is 32.

Adding to 21235222463 its reverse (36422253212), we get a palindrome (57657475675).

The spelling of 21235222463 in words is "twenty-one billion, two hundred thirty-five million, two hundred twenty-two thousand, four hundred sixty-three".