21210201211121 has 8 divisors (see below), whose sum is σ = 22858464573504. Its totient is φ = 19564324909200.

The previous prime is 21210201211061. The next prime is 21210201211181. The reversal of 21210201211121 is 12111210201212.

It is an interprime number because it is at equal distance from previous prime (21210201211061) and next prime (21210201211181).

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 21210201211121 - 2¹⁴ = 21210201194737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210201211121.

It is not an unprimeable number, because it can be changed into a prime (21210201211181) 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 7 ways as a sum of consecutive naturals, for example, 596746655 + ... + 596782196.

It is an arithmetic number, because the mean of its divisors is an integer number (2857308071688).

Almost surely, 2^{21210201211121} is an apocalyptic number.

It is an amenable number.

21210201211121 is a deficient number, since it is larger than the sum of its proper divisors (1648263362383).

21210201211121 is a wasteful number, since it uses less digits than its factorization.

21210201211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193530231.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21210201211121 its reverse (12111210201212), we get a palindrome (33321411412333).

The spelling of 21210201211121 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, two hundred eleven thousand, one hundred twenty-one".