21021210201 has 4 divisors (see below), whose sum is σ = 28028280272. Its totient is φ = 14014140132.

The previous prime is 21021210187. The next prime is 21021210211. The reversal of 21021210201 is 10201212012.

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 21021210201 - 2⁵ = 21021210169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021210211) 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, 3503535031 + ... + 3503535036.

It is an arithmetic number, because the mean of its divisors is an integer number (7007070068).

Almost surely, 2^21021210201 is an apocalyptic number.

It is an amenable number.

21021210201 is a deficient number, since it is larger than the sum of its proper divisors (7007070071).

21021210201 is an equidigital number, since it uses as much as digits as its factorization.

21021210201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007070070.

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

Adding to 21021210201 its reverse (10201212012), we get a palindrome (31222422213).

The spelling of 21021210201 in words is "twenty-one billion, twenty-one million, two hundred ten thousand, two hundred one".