21112061121 has 12 divisors (see below), whose sum is σ = 30506533200. Its totient is φ = 14069476440.

The previous prime is 21112061119. The next prime is 21112061129. The reversal of 21112061121 is 12116021112.

21112061121 is a `hidden beast` number, since 2 + 1 + 11 + 20 + 611 + 21 = 666.

It is not a de Polignac number, because 21112061121 - 2¹ = 21112061119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112061094 and 21112061103.

It is not an unprimeable number, because it can be changed into a prime (21112061129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410275 + ... + 458856.

It is an arithmetic number, because the mean of its divisors is an integer number (2542211100).

Almost surely, 2^21112061121 is an apocalyptic number.

It is an amenable number.

21112061121 is a deficient number, since it is larger than the sum of its proper divisors (9394472079).

21112061121 is a wasteful number, since it uses less digits than its factorization.

21112061121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871836 (or 871833 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21112061121 its reverse (12116021112), we get a palindrome (33228082233).

The spelling of 21112061121 in words is "twenty-one billion, one hundred twelve million, sixty-one thousand, one hundred twenty-one".