21000122101121 has 8 divisors (see below), whose sum is σ = 21002957745000. Its totient is φ = 20997286664832.

The previous prime is 21000122101103. The next prime is 21000122101169. The reversal of 21000122101121 is 12110122100012.

It can be written as a sum of positive squares in 4 ways, for example, as 5734535406721 + 15265586694400 = 2394689^2 + 3907120^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000122101121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000122101096 and 21000122101105.

It is not an unprimeable number, because it can be changed into a prime (21000122101171) 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, 321596351 + ... + 321661643.

It is an arithmetic number, because the mean of its divisors is an integer number (2625369718125).

Almost surely, 2^{21000122101121} is an apocalyptic number.

It is an amenable number.

21000122101121 is a deficient number, since it is larger than the sum of its proper divisors (2835643879).

21000122101121 is a wasteful number, since it uses less digits than its factorization.

21000122101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103795.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21000122101121 its reverse (12110122100012), we get a palindrome (33110244201133).

The spelling of 21000122101121 in words is "twenty-one trillion, one hundred twenty-two million, one hundred one thousand, one hundred twenty-one".