21102220122 has 16 divisors (see below), whose sum is σ = 44687054592. Its totient is φ = 6620304320.

The previous prime is 21102220091. The next prime is 21102220151. The reversal of 21102220122 is 22102220112.

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, 103442154 + ... + 103442357.

It is an arithmetic number, because the mean of its divisors is an integer number (2792940912).

Almost surely, 2^21102220122 is an apocalyptic number.

21102220122 is an abundant number, since it is smaller than the sum of its proper divisors (23584834470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21102220122 is a wasteful number, since it uses less digits than its factorization.

21102220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206884533.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21102220122 its reverse (22102220112), we get a palindrome (43204440234).

The spelling of 21102220122 in words is "twenty-one billion, one hundred two million, two hundred twenty thousand, one hundred twenty-two".