21363561221203 has 6 divisors (see below), whose sum is σ = 21956560000116. Its totient is φ = 20786167673352.

The previous prime is 21363561221141. The next prime is 21363561221221. The reversal of 21363561221203 is 30212216536312.

It is not a de Polignac number, because 21363561221203 - 2⁹ = 21363561220691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21363561251203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7802614125 + ... + 7802616862.

It is an arithmetic number, because the mean of its divisors is an integer number (3659426666686).

Almost surely, 2^{21363561221203} is an apocalyptic number.

21363561221203 is a deficient number, since it is larger than the sum of its proper divisors (592998778913).

21363561221203 is an equidigital number, since it uses as much as digits as its factorization.

21363561221203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15605231061 (or 15605231024 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 21363561221203 its reverse (30212216536312), we get a palindrome (51575777757515).

The spelling of 21363561221203 in words is "twenty-one trillion, three hundred sixty-three billion, five hundred sixty-one million, two hundred twenty-one thousand, two hundred three".