21221222110 has 32 divisors (see below), whose sum is σ = 42083367264. Its totient is φ = 7640400000.

The previous prime is 21221222083. The next prime is 21221222123. The reversal of 21221222110 is 1122212212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943941 + ... + 966160.

It is an arithmetic number, because the mean of its divisors is an integer number (1315105227).

Almost surely, 2^21221222110 is an apocalyptic number.

21221222110 is a deficient number, since it is larger than the sum of its proper divisors (20862145154).

21221222110 is a wasteful number, since it uses less digits than its factorization.

21221222110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910220.

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

Adding to 21221222110 its reverse (1122212212), we get a palindrome (22343434322).

The spelling of 21221222110 in words is "twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred ten".