21112220122 has 16 divisors (see below), whose sum is σ = 37765959552. Its totient is φ = 8654698800.

The previous prime is 21112220113. The next prime is 21112220203. The reversal of 21112220122 is 22102221112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112220096 and 21112220105.

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, 32782629 + ... + 32783272.

It is an arithmetic number, because the mean of its divisors is an integer number (2360372472).

Almost surely, 2^21112220122 is an apocalyptic number.

21112220122 is a deficient number, since it is larger than the sum of its proper divisors (16653739430).

21112220122 is a wasteful number, since it uses less digits than its factorization.

21112220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65565933.

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

Adding to 21112220122 its reverse (22102221112), we get a palindrome (43214441234).

The spelling of 21112220122 in words is "twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred twenty-two".