21210021201121 has 16 divisors (see below), whose sum is σ = 21469528080000. Its totient is φ = 20951759448576.

The previous prime is 21210021201041. The next prime is 21210021201157. The reversal of 21210021201121 is 12110212001212.

It is a cyclic number.

It is not a de Polignac number, because 21210021201121 - 2³³ = 21201431266529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210021201095 and 21210021201104.

It is not an unprimeable number, because it can be changed into a prime (21210021201221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71052145 + ... + 71350033.

It is an arithmetic number, because the mean of its divisors is an integer number (1341845505000).

Almost surely, 2^{21210021201121} is an apocalyptic number.

It is an amenable number.

21210021201121 is a deficient number, since it is larger than the sum of its proper divisors (259506878879).

21210021201121 is a wasteful number, since it uses less digits than its factorization.

21210021201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299976.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210021201121 its reverse (12110212001212), we get a palindrome (33320233202333).

The spelling of 21210021201121 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two hundred one thousand, one hundred twenty-one".