21121102222 has 16 divisors (see below), whose sum is σ = 34768766592. Its totient is φ = 9543011320.

The previous prime is 21121102207. The next prime is 21121102267. The reversal of 21121102222 is 22220112112.

It is a happy number.

It is a super-2 number, since 2×21121102222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121102196 and 21121102205.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2870728 + ... + 2878075.

It is an arithmetic number, because the mean of its divisors is an integer number (2173047912).

Almost surely, 2^21121102222 is an apocalyptic number.

21121102222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121102222 is a deficient number, since it is larger than the sum of its proper divisors (13647664370).

21121102222 is a wasteful number, since it uses less digits than its factorization.

21121102222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748983.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21121102222 its reverse (22220112112), we get a palindrome (43341214334).

The spelling of 21121102222 in words is "twenty-one billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-two".