21100103321201 has 4 divisors (see below), whose sum is σ = 21100386204900. Its totient is φ = 21099820437504.

The previous prime is 21100103321197. The next prime is 21100103321237. The reversal of 21100103321201 is 10212330100112.

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 19938502215025 + 1161601106176 = 4465255^2 + 1077776^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100103321201 - 2² = 21100103321197 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 21100103321201.

It is not an unprimeable number, because it can be changed into a prime (21100103311201) 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, 141329936 + ... + 141479153.

It is an arithmetic number, because the mean of its divisors is an integer number (5275096551225).

Almost surely, 2^{21100103321201} is an apocalyptic number.

It is an amenable number.

21100103321201 is a deficient number, since it is larger than the sum of its proper divisors (282883699).

21100103321201 is an equidigital number, since it uses as much as digits as its factorization.

21100103321201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282883698.

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

Adding to 21100103321201 its reverse (10212330100112), we get a palindrome (31312433421313).

The spelling of 21100103321201 in words is "twenty-one trillion, one hundred billion, one hundred three million, three hundred twenty-one thousand, two hundred one".