21122110222 has 16 divisors (see below), whose sum is σ = 32254868592. Its totient is φ = 10371049920.

The previous prime is 21122110199. The next prime is 21122110277. The reversal of 21122110222 is 22201122112.

It is a happy number.

It is a super-2 number, since 2×21122110222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122110196 and 21122110205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65028 + ... + 215575.

It is an arithmetic number, because the mean of its divisors is an integer number (2015929287).

Almost surely, 2^21122110222 is an apocalyptic number.

21122110222 is a deficient number, since it is larger than the sum of its proper divisors (11132758370).

21122110222 is a wasteful number, since it uses less digits than its factorization.

21122110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281283.

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

Adding to 21122110222 its reverse (22201122112), we get a palindrome (43323232334).

The spelling of 21122110222 in words is "twenty-one billion, one hundred twenty-two million, one hundred ten thousand, two hundred twenty-two".