21110101233121 has 4 divisors (see below), whose sum is σ = 21624981751044. Its totient is φ = 20595220715200.

The previous prime is 21110101233119. The next prime is 21110101233167. The reversal of 21110101233121 is 12133210101112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 829849943521 + 20280251289600 = 910961^2 + 4503360^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110101233121 - 2¹ = 21110101233119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110101233101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257440258900 + ... + 257440258981.

It is an arithmetic number, because the mean of its divisors is an integer number (5406245437761).

Almost surely, 2^{21110101233121} is an apocalyptic number.

It is an amenable number.

21110101233121 is a deficient number, since it is larger than the sum of its proper divisors (514880517923).

21110101233121 is an equidigital number, since it uses as much as digits as its factorization.

21110101233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514880517922.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21110101233121 its reverse (12133210101112), we get a palindrome (33243311334233).

The spelling of 21110101233121 in words is "twenty-one trillion, one hundred ten billion, one hundred one million, two hundred thirty-three thousand, one hundred twenty-one".