21210212201 has 8 divisors (see below), whose sum is σ = 21556664904. Its totient is φ = 20866435200.

The previous prime is 21210212171. The next prime is 21210212237. The reversal of 21210212201 is 10221201212.

It can be written as a sum of positive squares in 4 ways, for example, as 10181011801 + 11029200400 = 100901^2 + 105020^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210212201 - 2⁶ = 21210212137 is a prime.

It is a super-2 number, since 2×21210212201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212212201) 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 7 ways as a sum of consecutive naturals, for example, 652940 + ... + 684653.

It is an arithmetic number, because the mean of its divisors is an integer number (2694583113).

Almost surely, 2^21210212201 is an apocalyptic number.

It is an amenable number.

21210212201 is a deficient number, since it is larger than the sum of its proper divisors (346452703).

21210212201 is a wasteful number, since it uses less digits than its factorization.

21210212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337851.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210212201 its reverse (10221201212), we get a palindrome (31431413413).

The spelling of 21210212201 in words is "twenty-one billion, two hundred ten million, two hundred twelve thousand, two hundred one".