21110230100321 has 4 divisors (see below), whose sum is σ = 21192371073732. Its totient is φ = 21028089126912.

The previous prime is 21110230100317. The next prime is 21110230100357. The reversal of 21110230100321 is 12300103201112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16622459014225 + 4487771086096 = 4077065^2 + 2118436^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110230100321 - 2² = 21110230100317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110230100321.

It is not an unprimeable number, because it can be changed into a prime (21110530100321) 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, 41070486320 + ... + 41070486833.

It is an arithmetic number, because the mean of its divisors is an integer number (5298092768433).

Almost surely, 2^{21110230100321} is an apocalyptic number.

It is an amenable number.

21110230100321 is a deficient number, since it is larger than the sum of its proper divisors (82140973411).

21110230100321 is an equidigital number, since it uses as much as digits as its factorization.

21110230100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82140973410.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21110230100321 its reverse (12300103201112), we get a palindrome (33410333301433).

The spelling of 21110230100321 in words is "twenty-one trillion, one hundred ten billion, two hundred thirty million, one hundred thousand, three hundred twenty-one".