21113051063 has 4 divisors (see below), whose sum is σ = 22737131928. Its totient is φ = 19488970200.

The previous prime is 21113051059. The next prime is 21113051081. The reversal of 21113051063 is 36015031112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21113051063 - 2² = 21113051059 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 (21113051093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812040413 + ... + 812040438.

It is an arithmetic number, because the mean of its divisors is an integer number (5684282982).

Almost surely, 2^21113051063 is an apocalyptic number.

21113051063 is a deficient number, since it is larger than the sum of its proper divisors (1624080865).

21113051063 is a wasteful number, since it uses less digits than its factorization.

21113051063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624080864.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 21113051063 its reverse (36015031112), we get a palindrome (57128082175).

The spelling of 21113051063 in words is "twenty-one billion, one hundred thirteen million, fifty-one thousand, sixty-three".