21120320263 has 8 divisors (see below), whose sum is σ = 24263884800. Its totient is φ = 18008349720.

The previous prime is 21120320261. The next prime is 21120320327. The reversal of 21120320263 is 36202302112.

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 21120320263 - 2¹ = 21120320261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120320261) 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, 7897063 + ... + 7899736.

It is an arithmetic number, because the mean of its divisors is an integer number (3032985600).

Almost surely, 2^21120320263 is an apocalyptic number.

21120320263 is a deficient number, since it is larger than the sum of its proper divisors (3143564537).

21120320263 is a wasteful number, since it uses less digits than its factorization.

21120320263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15796997.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21120320263 its reverse (36202302112), we get a palindrome (57322622375).

The spelling of 21120320263 in words is "twenty-one billion, one hundred twenty million, three hundred twenty thousand, two hundred sixty-three".