21321101121 has 4 divisors (see below), whose sum is σ = 28428134832. Its totient is φ = 14214067412.

The previous prime is 21321101119. The next prime is 21321101141. The reversal of 21321101121 is 12110112312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21321101121 - 2¹ = 21321101119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21321101121.

It is not an unprimeable number, because it can be changed into a prime (21321101101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3553516851 + ... + 3553516856.

It is an arithmetic number, because the mean of its divisors is an integer number (7107033708).

Almost surely, 2^21321101121 is an apocalyptic number.

It is an amenable number.

21321101121 is a deficient number, since it is larger than the sum of its proper divisors (7107033711).

21321101121 is an equidigital number, since it uses as much as digits as its factorization.

21321101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7107033710.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21321101121 its reverse (12110112312), we get a palindrome (33431213433).

The spelling of 21321101121 in words is "twenty-one billion, three hundred twenty-one million, one hundred one thousand, one hundred twenty-one".