21210110122 has 16 divisors (see below), whose sum is σ = 31878312480. Its totient is φ = 10584023472.

The previous prime is 21210110111. The next prime is 21210110137. The reversal of 21210110122 is 22101101212.

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, 4318204 + ... + 4323112.

It is an arithmetic number, because the mean of its divisors is an integer number (1992394530).

Almost surely, 2^21210110122 is an apocalyptic number.

21210110122 is a deficient number, since it is larger than the sum of its proper divisors (10668202358).

21210110122 is a wasteful number, since it uses less digits than its factorization.

21210110122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8757.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210110122 its reverse (22101101212), we get a palindrome (43311211334).

The spelling of 21210110122 in words is "twenty-one billion, two hundred ten million, one hundred ten thousand, one hundred twenty-two".