21120110121 has 16 divisors (see below), whose sum is σ = 31140987840. Its totient is φ = 12624721920.

The previous prime is 21120110107. The next prime is 21120110147. The reversal of 21120110121 is 12101102112.

It is not a de Polignac number, because 21120110121 - 2⁹ = 21120109609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120110097 and 21120110106.

It is not an unprimeable number, because it can be changed into a prime (21120110161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4381176 + ... + 4385993.

It is an arithmetic number, because the mean of its divisors is an integer number (1946311740).

Almost surely, 2^21120110121 is an apocalyptic number.

It is an amenable number.

21120110121 is a deficient number, since it is larger than the sum of its proper divisors (10020877719).

21120110121 is a wasteful number, since it uses less digits than its factorization.

21120110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8767256.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21120110121 its reverse (12101102112), we get a palindrome (33221212233).

The spelling of 21120110121 in words is "twenty-one billion, one hundred twenty million, one hundred ten thousand, one hundred twenty-one".