21112001012121 has 8 divisors (see below), whose sum is σ = 28149898782720. Its totient is φ = 14074385291472.

The previous prime is 21112001012093. The next prime is 21112001012147. The reversal of 21112001012121 is 12121010021112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21112001012121 - 2²⁵ = 21111967457689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112001012121.

It is not an unprimeable number, because it can be changed into a prime (21112001012021) 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 7 ways as a sum of consecutive naturals, for example, 70337770 + ... + 70637283.

It is an arithmetic number, because the mean of its divisors is an integer number (3518737347840).

Almost surely, 2^{21112001012121} is an apocalyptic number.

It is an amenable number.

21112001012121 is a deficient number, since it is larger than the sum of its proper divisors (7037897770599).

21112001012121 is a wasteful number, since it uses less digits than its factorization.

21112001012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141024975.

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

Adding to 21112001012121 its reverse (12121010021112), we get a palindrome (33233011033233).

The spelling of 21112001012121 in words is "twenty-one trillion, one hundred twelve billion, one million, twelve thousand, one hundred twenty-one".