21201002200121 has 8 divisors (see below), whose sum is σ = 22355928223200. Its totient is φ = 20049984557280.

The previous prime is 21201002200111. The next prime is 21201002200123. The reversal of 21201002200121 is 12100220010212.

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

It is not a de Polignac number, because 21201002200121 - 2¹⁴ = 21201002183737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201002200096 and 21201002200105.

It is not an unprimeable number, because it can be changed into a prime (21201002200123) 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, 977083916 + ... + 977105613.

It is an arithmetic number, because the mean of its divisors is an integer number (2794491027900).

Almost surely, 2^{21201002200121} is an apocalyptic number.

It is an amenable number.

21201002200121 is a deficient number, since it is larger than the sum of its proper divisors (1154926023079).

21201002200121 is a wasteful number, since it uses less digits than its factorization.

21201002200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954190119.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21201002200121 its reverse (12100220010212), we get a palindrome (33301222210333).

The spelling of 21201002200121 in words is "twenty-one trillion, two hundred one billion, two million, two hundred thousand, one hundred twenty-one".