21121102000121 has 4 divisors (see below), whose sum is σ = 22363519764852. Its totient is φ = 19878684235392.

The previous prime is 21121102000093. The next prime is 21121102000127. The reversal of 21121102000121 is 12100020112112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6328424484496 + 14792677515625 = 2515636^2 + 3846125^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121102000121 - 2¹⁰ = 21121101999097 is a prime.

It is a super-2 number, since 2×21121102000121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121102000096 and 21121102000105.

It is not an unprimeable number, because it can be changed into a prime (21121102000127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621208882340 + ... + 621208882373.

It is an arithmetic number, because the mean of its divisors is an integer number (5590879941213).

Almost surely, 2^{21121102000121} is an apocalyptic number.

It is an amenable number.

21121102000121 is a deficient number, since it is larger than the sum of its proper divisors (1242417764731).

21121102000121 is a wasteful number, since it uses less digits than its factorization.

21121102000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242417764730.

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

Adding to 21121102000121 its reverse (12100020112112), we get a palindrome (33221122112233).

The spelling of 21121102000121 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, one hundred twenty-one", and thus it is an aban number.