21112030121 has 16 divisors (see below), whose sum is σ = 26424451200. Its totient is φ = 16420900608.

The previous prime is 21112030111. The next prime is 21112030171. The reversal of 21112030121 is 12103021112.

It is a de Polignac number, because none of the positive numbers 2^k-21112030121 is a prime.

It is a super-2 number, since 2×21112030121² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21112030096 and 21112030105.

It is not an unprimeable number, because it can be changed into a prime (21112030111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1960736 + ... + 1971473.

It is an arithmetic number, because the mean of its divisors is an integer number (1651528200).

Almost surely, 2^21112030121 is an apocalyptic number.

It is an amenable number.

21112030121 is a deficient number, since it is larger than the sum of its proper divisors (5312421079).

21112030121 is a wasteful number, since it uses less digits than its factorization.

21112030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932288.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21112030121 its reverse (12103021112), we get a palindrome (33215051233).

Subtracting from 21112030121 its reverse (12103021112), we obtain a palindrome (9009009009).

The spelling of 21112030121 in words is "twenty-one billion, one hundred twelve million, thirty thousand, one hundred twenty-one".