21210110022222 has 48 divisors (see below), whose sum is σ = 50619715406208. Its totient is φ = 6364905031440.

The previous prime is 21210110022217. The next prime is 21210110022247. The reversal of 21210110022222 is 22222001101212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21210110022195 and 21210110022204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 519988188 + ... + 520028975.

It is an arithmetic number, because the mean of its divisors is an integer number (1054577404296).

Almost surely, 2^{21210110022222} is an apocalyptic number.

21210110022222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210110022222 is an abundant number, since it is smaller than the sum of its proper divisors (29409605383986).

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

21210110022222 is a wasteful number, since it uses less digits than its factorization.

21210110022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040017285 (or 1040017282 counting only the distinct ones).

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

Adding to 21210110022222 its reverse (22222001101212), we get a palindrome (43432111123434).

The spelling of 21210110022222 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, twenty-two thousand, two hundred twenty-two".