21121021101121 has 8 divisors (see below), whose sum is σ = 21145766722304. Its totient is φ = 21096276990480.

The previous prime is 21121021101107. The next prime is 21121021101161. The reversal of 21121021101121 is 12110112012112.

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 21121021101121 - 2³¹ = 21118873617473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121021101095 and 21121021101104.

It is not an unprimeable number, because it can be changed into a prime (21121021101161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28933936 + ... + 29654926.

It is an arithmetic number, because the mean of its divisors is an integer number (2643220840288).

Almost surely, 2^{21121021101121} is an apocalyptic number.

It is an amenable number.

21121021101121 is a deficient number, since it is larger than the sum of its proper divisors (24745621183).

21121021101121 is an equidigital number, since it uses as much as digits as its factorization.

21121021101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755271.

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

Adding to 21121021101121 its reverse (12110112012112), we get a palindrome (33231133113233).

The spelling of 21121021101121 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred one thousand, one hundred twenty-one".