21210122222210 has 8 divisors (see below), whose sum is σ = 38178219999996. Its totient is φ = 8484048888880.

The previous prime is 21210122222183. The next prime is 21210122222213. The reversal of 21210122222210 is 1222222101212.

It can be written as a sum of positive squares in 2 ways, for example, as 19462805718889 + 1747316503321 = 4411667^2 + 1321861^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21210122222213) 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 3 ways as a sum of consecutive naturals, for example, 1060506111101 + ... + 1060506111120.

Almost surely, 2^{21210122222210} is an apocalyptic number.

21210122222210 is a deficient number, since it is larger than the sum of its proper divisors (16968097777786).

21210122222210 is a wasteful number, since it uses less digits than its factorization.

21210122222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121012222228.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21210122222210 its reverse (1222222101212), we get a palindrome (22432344323422).

The spelling of 21210122222210 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred ten".