21630031102243 has 4 divisors (see below), whose sum is σ = 21630041251920. Its totient is φ = 21630020952568.

The previous prime is 21630031102231. The next prime is 21630031102247. The reversal of 21630031102243 is 34220113003612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21630031102243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21630031102247) 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, 508708 + ... + 6596881.

It is an arithmetic number, because the mean of its divisors is an integer number (5407510312980).

Almost surely, 2^{21630031102243} is an apocalyptic number.

21630031102243 is a deficient number, since it is larger than the sum of its proper divisors (10149677).

21630031102243 is an equidigital number, since it uses as much as digits as its factorization.

21630031102243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10149676.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 21630031102243 its reverse (34220113003612), we get a palindrome (55850144105855).

The spelling of 21630031102243 in words is "twenty-one trillion, six hundred thirty billion, thirty-one million, one hundred two thousand, two hundred forty-three".