21101002201 has 4 divisors (see below), whose sum is σ = 21499134372. Its totient is φ = 20702870032.

The previous prime is 21101002199. The next prime is 21101002249. The reversal of 21101002201 is 10220010112.

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 8551625625 + 12549376576 = 92475^2 + 112024^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101002201 - 2¹ = 21101002199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101003201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199066006 + ... + 199066111.

It is an arithmetic number, because the mean of its divisors is an integer number (5374783593).

Almost surely, 2^21101002201 is an apocalyptic number.

It is an amenable number.

21101002201 is a deficient number, since it is larger than the sum of its proper divisors (398132171).

21101002201 is an equidigital number, since it uses as much as digits as its factorization.

21101002201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398132170.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101002201 its reverse (10220010112), we get a palindrome (31321012313).

The spelling of 21101002201 in words is "twenty-one billion, one hundred one million, two thousand, two hundred one".