21110412555121 has 16 divisors (see below), whose sum is σ = 21264514116160. Its totient is φ = 20956618520640.

The previous prime is 21110412555083. The next prime is 21110412555139. The reversal of 21110412555121 is 12155521401112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21110412555121 - 2¹¹ = 21110412553073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110412555181) 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, 1735619386 + ... + 1735631548.

It is an arithmetic number, because the mean of its divisors is an integer number (1329032132260).

Almost surely, 2^{21110412555121} is an apocalyptic number.

It is an amenable number.

21110412555121 is a deficient number, since it is larger than the sum of its proper divisors (154101561039).

21110412555121 is a wasteful number, since it uses less digits than its factorization.

21110412555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23776.

The product of its (nonzero) digits is 4000, while the sum is 31.

Adding to 21110412555121 its reverse (12155521401112), we get a palindrome (33265933956233).

The spelling of 21110412555121 in words is "twenty-one trillion, one hundred ten billion, four hundred twelve million, five hundred fifty-five thousand, one hundred twenty-one".