21210010012201 has 4 divisors (see below), whose sum is σ = 21428669909332. Its totient is φ = 20991350115072.

The previous prime is 21210010012181. The next prime is 21210010012229. The reversal of 21210010012201 is 10221001001212.

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 4191126106176 + 17018883906025 = 2047224^2 + 4125395^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210010012201 - 2⁴³ = 12413916989993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210010012291) 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, 109329948420 + ... + 109329948613.

It is an arithmetic number, because the mean of its divisors is an integer number (5357167477333).

Almost surely, 2^{21210010012201} is an apocalyptic number.

It is an amenable number.

21210010012201 is a deficient number, since it is larger than the sum of its proper divisors (218659897131).

21210010012201 is an equidigital number, since it uses as much as digits as its factorization.

21210010012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218659897130.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210010012201 its reverse (10221001001212), we get a palindrome (31431011013413).

The spelling of 21210010012201 in words is "twenty-one trillion, two hundred ten billion, ten million, twelve thousand, two hundred one".