21120021100201 has 8 divisors (see below), whose sum is σ = 21409972875720. Its totient is φ = 20830086525312.

The previous prime is 21120021100193. The next prime is 21120021100207. The reversal of 21120021100201 is 10200112002112.

It can be written as a sum of positive squares in 4 ways, for example, as 8953709675625 + 12166311424576 = 2992275^2 + 3488024^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120021100201 - 2³ = 21120021100193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120021100207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1817806 + ... + 6748663.

It is an arithmetic number, because the mean of its divisors is an integer number (2676246609465).

Almost surely, 2^{21120021100201} is an apocalyptic number.

It is an amenable number.

21120021100201 is a deficient number, since it is larger than the sum of its proper divisors (289951775519).

21120021100201 is an equidigital number, since it uses as much as digits as its factorization.

21120021100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8600315.

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

Adding to 21120021100201 its reverse (10200112002112), we get a palindrome (31320133102313).

The spelling of 21120021100201 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, one hundred thousand, two hundred one".