21010221330121 has 16 divisors (see below), whose sum is σ = 21749158987776. Its totient is φ = 20280306203136.

The previous prime is 21010221330089. The next prime is 21010221330149. The reversal of 21010221330121 is 12103312201012.

It is a cyclic number.

It is not a de Polignac number, because 21010221330121 - 2⁵ = 21010221330089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010221330191) 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, 93571830 + ... + 93796096.

It is an arithmetic number, because the mean of its divisors is an integer number (1359322436736).

Almost surely, 2^{21010221330121} is an apocalyptic number.

It is an amenable number.

21010221330121 is a deficient number, since it is larger than the sum of its proper divisors (738937657655).

21010221330121 is a wasteful number, since it uses less digits than its factorization.

21010221330121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244368.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21010221330121 its reverse (12103312201012), we get a palindrome (33113533531133).

The spelling of 21010221330121 in words is "twenty-one trillion, ten billion, two hundred twenty-one million, three hundred thirty thousand, one hundred twenty-one".