21210201210221 has 16 divisors (see below), whose sum is σ = 21670729436928. Its totient is φ = 20753323545600.

The previous prime is 21210201210169. The next prime is 21210201210269. The reversal of 21210201210221 is 12201210201212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210201210221 is a prime.

It is a super-3 number, since 3×21210201210221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210201210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210201210721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322158776 + ... + 322224606.

It is an arithmetic number, because the mean of its divisors is an integer number (1354420589808).

Almost surely, 2^{21210201210221} is an apocalyptic number.

It is an amenable number.

21210201210221 is a deficient number, since it is larger than the sum of its proper divisors (460528226707).

21210201210221 is a wasteful number, since it uses less digits than its factorization.

21210201210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93452.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210201210221 its reverse (12201210201212), we get a palindrome (33411411411433).

The spelling of 21210201210221 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, two hundred ten thousand, two hundred twenty-one".