21000110012121 has 8 divisors (see below), whose sum is σ = 28003583581344. Its totient is φ = 13998354892160.

The previous prime is 21000110012071. The next prime is 21000110012143. The reversal of 21000110012121 is 12121001100012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000110012121 - 2¹⁴ = 21000109995737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000110012097 and 21000110012106.

It is not an unprimeable number, because it can be changed into a prime (21000110012621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429583800 + ... + 429632681.

It is an arithmetic number, because the mean of its divisors is an integer number (3500447947668).

Almost surely, 2^{21000110012121} is an apocalyptic number.

It is an amenable number.

21000110012121 is a deficient number, since it is larger than the sum of its proper divisors (7003473569223).

21000110012121 is an equidigital number, since it uses as much as digits as its factorization.

21000110012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859224631.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21000110012121 its reverse (12121001100012), we get a palindrome (33121111112133).

The spelling of 21000110012121 in words is "twenty-one trillion, one hundred ten million, twelve thousand, one hundred twenty-one".