21102244063 has 4 divisors (see below), whose sum is σ = 21147821728. Its totient is φ = 21056666400.

The previous prime is 21102244061. The next prime is 21102244067. The reversal of 21102244063 is 36044220112.

It is a happy number.

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 21102244063 - 2¹ = 21102244061 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 (21102244061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22788138 + ... + 22789063.

It is an arithmetic number, because the mean of its divisors is an integer number (5286955432).

Almost surely, 2^21102244063 is an apocalyptic number.

21102244063 is a deficient number, since it is larger than the sum of its proper divisors (45577665).

21102244063 is an equidigital number, since it uses as much as digits as its factorization.

21102244063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45577664.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21102244063 its reverse (36044220112), we get a palindrome (57146464175).

The spelling of 21102244063 in words is "twenty-one billion, one hundred two million, two hundred forty-four thousand, sixty-three".