21113022112121 has 4 divisors (see below), whose sum is σ = 21367395872592. Its totient is φ = 20858648351652.

The previous prime is 21113022112003. The next prime is 21113022112123. The reversal of 21113022112121 is 12121122031112.

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 a de Polignac number, because none of the positive numbers 2^k-21113022112121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113022112093 and 21113022112102.

It is not an unprimeable number, because it can be changed into a prime (21113022112123) 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 3 ways as a sum of consecutive naturals, for example, 127186880111 + ... + 127186880276.

It is an arithmetic number, because the mean of its divisors is an integer number (5341848968148).

Almost surely, 2^{21113022112121} is an apocalyptic number.

It is an amenable number.

21113022112121 is a deficient number, since it is larger than the sum of its proper divisors (254373760471).

21113022112121 is an equidigital number, since it uses as much as digits as its factorization.

21113022112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254373760470.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21113022112121 its reverse (12121122031112), we get a palindrome (33234144143233).

The spelling of 21113022112121 in words is "twenty-one trillion, one hundred thirteen billion, twenty-two million, one hundred twelve thousand, one hundred twenty-one".