21120201000121 has 8 divisors (see below), whose sum is σ = 22363803163080. Its totient is φ = 19876736325888.

The previous prime is 21120201000089. The next prime is 21120201000131. The reversal of 21120201000121 is 12100010202112.

It can be written as a sum of positive squares in 4 ways, for example, as 8917754760121 + 12202446240000 = 2986261^2 + 3493200^2 .

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 21120201000121 - 2⁵ = 21120201000089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120201000131) 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, 34055826 + ... + 34670443.

It is an arithmetic number, because the mean of its divisors is an integer number (2795475395385).

Almost surely, 2^{21120201000121} is an apocalyptic number.

It is an amenable number.

21120201000121 is a deficient number, since it is larger than the sum of its proper divisors (1243602162959).

21120201000121 is a wasteful number, since it uses less digits than its factorization.

21120201000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68744363.

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

Adding to 21120201000121 its reverse (12100010202112), we get a palindrome (33220211202233).

The spelling of 21120201000121 in words is "twenty-one trillion, one hundred twenty billion, two hundred one million, one hundred twenty-one", and thus it is an aban number.