21110012201121 has 16 divisors (see below), whose sum is σ = 28204092652800. Its totient is φ = 14044662722448.

The previous prime is 21110012201099. The next prime is 21110012201123. The reversal of 21110012201121 is 12110221001112.

It is a happy number.

It is not a de Polignac number, because 21110012201121 - 2³⁹ = 20560256387233 is a prime.

It is a super-3 number, since 3×21110012201121³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110012201121.

It is not an unprimeable number, because it can be changed into a prime (21110012201123) 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, 28551 + ... + 6497756.

It is an arithmetic number, because the mean of its divisors is an integer number (1762755790800).

Almost surely, 2^{21110012201121} is an apocalyptic number.

It is an amenable number.

21110012201121 is a deficient number, since it is larger than the sum of its proper divisors (7094080451679).

21110012201121 is a wasteful number, since it uses less digits than its factorization.

21110012201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6528508.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21110012201121 its reverse (12110221001112), we get a palindrome (33220233202233).

The spelling of 21110012201121 in words is "twenty-one trillion, one hundred ten billion, twelve million, two hundred one thousand, one hundred twenty-one".