21011201002121 has 16 divisors (see below), whose sum is σ = 23493630883968. Its totient is φ = 18628474051200.

The previous prime is 21011201002111. The next prime is 21011201002147. The reversal of 21011201002121 is 12120010211012.

It is a cyclic number.

It is not a de Polignac number, because 21011201002121 - 2¹⁰ = 21011201001097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011201002096 and 21011201002105.

It is not an unprimeable number, because it can be changed into a prime (21011201002111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107806220 + ... + 108000941.

It is an arithmetic number, because the mean of its divisors is an integer number (1468351930248).

Almost surely, 2^{21011201002121} is an apocalyptic number.

It is an amenable number.

21011201002121 is a deficient number, since it is larger than the sum of its proper divisors (2482429881847).

21011201002121 is a wasteful number, since it uses less digits than its factorization.

21011201002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215807392.

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

Adding to 21011201002121 its reverse (12120010211012), we get a palindrome (33131211213133).

The spelling of 21011201002121 in words is "twenty-one trillion, eleven billion, two hundred one million, two thousand, one hundred twenty-one".