21220223122 has 24 divisors (see below), whose sum is σ = 37548645120. Its totient is φ = 8966288520.

The previous prime is 21220223111. The next prime is 21220223147. The reversal of 21220223122 is 22132202212.

It is a self number, because there is not a number n which added to its sum of digits gives 21220223122.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1517922 + ... + 1531837.

It is an arithmetic number, because the mean of its divisors is an integer number (1564526880).

Almost surely, 2^21220223122 is an apocalyptic number.

21220223122 is a deficient number, since it is larger than the sum of its proper divisors (16328421998).

21220223122 is a wasteful number, since it uses less digits than its factorization.

21220223122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049846 (or 3049839 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21220223122 its reverse (22132202212), we get a palindrome (43352425334).

The spelling of 21220223122 in words is "twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, one hundred twenty-two".