21120220122 has 16 divisors (see below), whose sum is σ = 42870895392. Its totient is φ = 6934997520.

The previous prime is 21120220117. The next prime is 21120220129. The reversal of 21120220122 is 22102202112.

It is not an unprimeable number, because it can be changed into a prime (21120220129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26268529 + ... + 26269332.

It is an arithmetic number, because the mean of its divisors is an integer number (2679430962).

Almost surely, 2^21120220122 is an apocalyptic number.

21120220122 is an abundant number, since it is smaller than the sum of its proper divisors (21750675270).

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

21120220122 is a wasteful number, since it uses less digits than its factorization.

21120220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52537933.

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

Adding to 21120220122 its reverse (22102202112), we get a palindrome (43222422234).

The spelling of 21120220122 in words is "twenty-one billion, one hundred twenty million, two hundred twenty thousand, one hundred twenty-two".