21220112211210 has 96 divisors (see below), whose sum is σ = 60330920083200. Its totient is φ = 5132050358400.

The previous prime is 21220112211191. The next prime is 21220112211211. The reversal of 21220112211210 is 1211221102212.

21220112211210 is a `hidden beast` number, since 2 + 1 + 220 + 11 + 221 + 1 + 210 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21220112211211) 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 47 ways as a sum of consecutive naturals, for example, 25039810 + ... + 25873389.

It is an arithmetic number, because the mean of its divisors is an integer number (628447084200).

Almost surely, 2^{21220112211210} is an apocalyptic number.

21220112211210 is an abundant number, since it is smaller than the sum of its proper divisors (39110807871990).

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

21220112211210 is a wasteful number, since it uses less digits than its factorization.

21220112211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50913644 (or 50913641 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21220112211210 its reverse (1211221102212), we get a palindrome (22431333313422).

The spelling of 21220112211210 in words is "twenty-one trillion, two hundred twenty billion, one hundred twelve million, two hundred eleven thousand, two hundred ten".