21211100220222 has 48 divisors (see below), whose sum is σ = 51752596446720. Its totient is φ = 6220263992400.

The previous prime is 21211100220221. The next prime is 21211100220287. The reversal of 21211100220222 is 22202200111212.

It is a happy number.

21211100220222 is a `hidden beast` number, since 2 + 1 + 211 + 10 + 0 + 220 + 222 = 666.

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 = 21211100220195 and 21211100220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211100220221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1727844972 + ... + 1727857247.

It is an arithmetic number, because the mean of its divisors is an integer number (1078179092640).

Almost surely, 2^{21211100220222} is an apocalyptic number.

21211100220222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211100220222 is an abundant number, since it is smaller than the sum of its proper divisors (30541496226498).

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

21211100220222 is a wasteful number, since it uses less digits than its factorization.

21211100220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455702269 (or 3455702266 counting only the distinct ones).

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

Adding to 21211100220222 its reverse (22202200111212), we get a palindrome (43413300331434).

The spelling of 21211100220222 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, two hundred twenty thousand, two hundred twenty-two".