21101200122 has 64 divisors (see below), whose sum is σ = 45931968000. Its totient is φ = 6435542016.

The previous prime is 21101200067. The next prime is 21101200123. The reversal of 21101200122 is 22100210112.

It is a junction number, because it is equal to n+sod(n) for n = 21101200098 and 21101200107.

It is not an unprimeable number, because it can be changed into a prime (21101200123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7542828 + ... + 7545624.

It is an arithmetic number, because the mean of its divisors is an integer number (717687000).

Almost surely, 2^21101200122 is an apocalyptic number.

21101200122 is an abundant number, since it is smaller than the sum of its proper divisors (24830767878).

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

21101200122 is a wasteful number, since it uses less digits than its factorization.

21101200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4855.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21101200122 its reverse (22100210112), we get a palindrome (43201410234).

The spelling of 21101200122 in words is "twenty-one billion, one hundred one million, two hundred thousand, one hundred twenty-two".