21002112000121 has 8 divisors (see below), whose sum is σ = 24006509037504. Its totient is φ = 17998738793520.

The previous prime is 21002112000101. The next prime is 21002112000173. The reversal of 21002112000121 is 12100021120012.

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 21002112000121 - 2³⁹ = 20452356186233 is a prime.

It is a super-3 number, since 3×21002112000121³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21002112000101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255913735 + ... + 255995788.

It is an arithmetic number, because the mean of its divisors is an integer number (3000813629688).

Almost surely, 2^{21002112000121} is an apocalyptic number.

It is an amenable number.

21002112000121 is a deficient number, since it is larger than the sum of its proper divisors (3004397037383).

21002112000121 is an equidigital number, since it uses as much as digits as its factorization.

21002112000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511915391.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21002112000121 its reverse (12100021120012), we get a palindrome (33102133120133).

The spelling of 21002112000121 in words is "twenty-one trillion, two billion, one hundred twelve million, one hundred twenty-one", and thus it is an aban number.