21110220001201 has 4 divisors (see below), whose sum is σ = 21327851135332. Its totient is φ = 20892588867072.

The previous prime is 21110220001187. The next prime is 21110220001207. The reversal of 21110220001201 is 10210002201112.

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 3852210917025 + 17258009084176 = 1962705^2 + 4154276^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110220001201 - 2¹⁵ = 21110219968433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110220001207) 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, 108815566920 + ... + 108815567113.

It is an arithmetic number, because the mean of its divisors is an integer number (5331962783833).

Almost surely, 2^{21110220001201} is an apocalyptic number.

It is an amenable number.

21110220001201 is a deficient number, since it is larger than the sum of its proper divisors (217631134131).

21110220001201 is an equidigital number, since it uses as much as digits as its factorization.

21110220001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217631134130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21110220001201 its reverse (10210002201112), we get a palindrome (31320222202313).

The spelling of 21110220001201 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty million, one thousand, two hundred one".