21012210222210 has 32 divisors (see below), whose sum is σ = 56032560593280. Its totient is φ = 5603256059184.

The previous prime is 21012210222161. The next prime is 21012210222217. The reversal of 21012210222210 is 1222201221012.

It is a happy number.

21012210222210 is a `hidden beast` number, since 2 + 10 + 1 + 221 + 0 + 222 + 210 = 666.

It is a super-3 number, since 3×21012210222210³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21012210222217) 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 15 ways as a sum of consecutive naturals, for example, 38911500142 + ... + 38911500681.

It is an arithmetic number, because the mean of its divisors is an integer number (1751017518540).

Almost surely, 2^{21012210222210} is an apocalyptic number.

21012210222210 is an abundant number, since it is smaller than the sum of its proper divisors (35020350371070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012210222210 is a wasteful number, since it uses less digits than its factorization.

21012210222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77823000839 (or 77823000833 counting only the distinct ones).

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

Adding to 21012210222210 its reverse (1222201221012), we get a palindrome (22234411443222).

The spelling of 21012210222210 in words is "twenty-one trillion, twelve billion, two hundred ten million, two hundred twenty-two thousand, two hundred ten".