21102202201001 has 4 divisors (see below), whose sum is σ = 21616890059604. Its totient is φ = 20587514342400.

The previous prime is 21102202200917. The next prime is 21102202201043. The reversal of 21102202201001 is 10010220220112.

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 4502289859600 + 16599912341401 = 2121860^2 + 4074299^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102202201001 - 2¹⁰ = 21102202199977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21102202231001) 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, 257343929240 + ... + 257343929321.

It is an arithmetic number, because the mean of its divisors is an integer number (5404222514901).

Almost surely, 2^{21102202201001} is an apocalyptic number.

It is an amenable number.

21102202201001 is a deficient number, since it is larger than the sum of its proper divisors (514687858603).

21102202201001 is an equidigital number, since it uses as much as digits as its factorization.

21102202201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514687858602.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21102202201001 its reverse (10010220220112), we get a palindrome (31112422421113).

The spelling of 21102202201001 in words is "twenty-one trillion, one hundred two billion, two hundred two million, two hundred one thousand, one".