21102102201 has 4 divisors (see below), whose sum is σ = 28136136272. Its totient is φ = 14068068132.

The previous prime is 21102102199. The next prime is 21102102223. The reversal of 21102102201 is 10220120112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21102102201 - 2¹ = 21102102199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102102701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3517017031 + ... + 3517017036.

It is an arithmetic number, because the mean of its divisors is an integer number (7034034068).

Almost surely, 2^21102102201 is an apocalyptic number.

It is an amenable number.

21102102201 is a deficient number, since it is larger than the sum of its proper divisors (7034034071).

21102102201 is an equidigital number, since it uses as much as digits as its factorization.

21102102201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034034070.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21102102201 its reverse (10220120112), we get a palindrome (31322222313).

The spelling of 21102102201 in words is "twenty-one billion, one hundred two million, one hundred two thousand, two hundred one".