21202100201 has 4 divisors (see below), whose sum is σ = 21202686852. Its totient is φ = 21201513552.

The previous prime is 21202100197. The next prime is 21202100207. The reversal of 21202100201 is 10200120212.

It is a happy number.

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 16743066025 + 4459034176 = 129395^2 + 66776^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202100201 - 2² = 21202100197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202100207) 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, 235286 + ... + 312671.

It is an arithmetic number, because the mean of its divisors is an integer number (5300671713).

Almost surely, 2^21202100201 is an apocalyptic number.

It is an amenable number.

21202100201 is a deficient number, since it is larger than the sum of its proper divisors (586651).

21202100201 is an equidigital number, since it uses as much as digits as its factorization.

21202100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586650.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21202100201 its reverse (10200120212), we get a palindrome (31402220413).

The spelling of 21202100201 in words is "twenty-one billion, two hundred two million, one hundred thousand, two hundred one".