11211122121021 has 32 divisors (see below), whose sum is σ = 17030235121920. Its totient is φ = 7286353468992.

The previous prime is 11211122121013. The next prime is 11211122121077. The reversal of 11211122121021 is 12012122111211.

It is a happy number.

11211122121021 is a `hidden beast` number, since 1 + 1 + 211 + 1 + 221 + 210 + 21 = 666.

It is not a de Polignac number, because 11211122121021 - 2³ = 11211122121013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211122120985 and 11211122121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211112121021) 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 31 ways as a sum of consecutive naturals, for example, 24725865 + ... + 25175198.

It is an arithmetic number, because the mean of its divisors is an integer number (532194847560).

Almost surely, 2^{11211122121021} is an apocalyptic number.

It is an amenable number.

11211122121021 is a deficient number, since it is larger than the sum of its proper divisors (5819113000899).

11211122121021 is a wasteful number, since it uses less digits than its factorization.

11211122121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49901282 (or 49901276 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11211122121021 its reverse (12012122111211), we get a palindrome (23223244232232).

The spelling of 11211122121021 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".