21210122200221 has 48 divisors (see below), whose sum is σ = 31417160201856. Its totient is φ = 13784502872448.

The previous prime is 21210122200193. The next prime is 21210122200247. The reversal of 21210122200221 is 12200222101212.

It is a happy number.

21210122200221 is a `hidden beast` number, since 2 + 1 + 210 + 12 + 220 + 0 + 221 = 666.

It is not a de Polignac number, because 21210122200221 - 2¹⁰ = 21210122199197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210122200194 and 21210122200203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210122200271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92614371 + ... + 92843103.

It is an arithmetic number, because the mean of its divisors is an integer number (654524170872).

Almost surely, 2^{21210122200221} is an apocalyptic number.

It is an amenable number.

21210122200221 is a deficient number, since it is larger than the sum of its proper divisors (10207038001635).

21210122200221 is a wasteful number, since it uses less digits than its factorization.

21210122200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230402 (or 230399 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210122200221 its reverse (12200222101212), we get a palindrome (33410344301433).

Subtracting from 21210122200221 its reverse (12200222101212), we obtain a palindrome (9009900099009).

The spelling of 21210122200221 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred thousand, two hundred twenty-one".