21100202021201 has 4 divisors (see below), whose sum is σ = 21103040748132. Its totient is φ = 21097363294272.

The previous prime is 21100202021149. The next prime is 21100202021203. The reversal of 21100202021201 is 10212020200112.

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 5903272012225 + 15196930008976 = 2429665^2 + 3898324^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100202021201 - 2³⁰ = 21099128279377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100202021203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1419352316 + ... + 1419367181.

It is an arithmetic number, because the mean of its divisors is an integer number (5275760187033).

Almost surely, 2^{21100202021201} is an apocalyptic number.

It is an amenable number.

21100202021201 is a deficient number, since it is larger than the sum of its proper divisors (2838726931).

21100202021201 is an equidigital number, since it uses as much as digits as its factorization.

21100202021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838726930.

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

Adding to 21100202021201 its reverse (10212020200112), we get a palindrome (31312222221313).

The spelling of 21100202021201 in words is "twenty-one trillion, one hundred billion, two hundred two million, twenty-one thousand, two hundred one".