21002122222110 has 24 divisors (see below), whose sum is σ = 54605517777720. Its totient is φ = 5600565925872.

The previous prime is 21002122222093. The next prime is 21002122222111. The reversal of 21002122222110 is 1122222120012.

It is a happy number.

21002122222110 is a `hidden beast` number, since 21 + 0 + 0 + 212 + 222 + 211 + 0 = 666.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002122222111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116678456700 + ... + 116678456879.

It is an arithmetic number, because the mean of its divisors is an integer number (2275229907405).

Almost surely, 2^{21002122222110} is an apocalyptic number.

21002122222110 is an abundant number, since it is smaller than the sum of its proper divisors (33603395555610).

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

21002122222110 is a wasteful number, since it uses less digits than its factorization.

21002122222110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233356913592 (or 233356913589 counting only the distinct ones).

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

Adding to 21002122222110 its reverse (1122222120012), we get a palindrome (22124344342122).

The spelling of 21002122222110 in words is "twenty-one trillion, two billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred ten".