11121021021 has 16 divisors (see below), whose sum is σ = 16194816000. Its totient is φ = 6732185520.

The previous prime is 11121020987. The next prime is 11121021061. The reversal of 11121021021 is 12012012111.

It is not a de Polignac number, because 11121021021 - 2⁶ = 11121020957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11121020988 and 11121021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121021061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166771 + ... + 223728.

It is an arithmetic number, because the mean of its divisors is an integer number (1012176000).

Almost surely, 2^11121021021 is an apocalyptic number.

11121021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121021021 is a deficient number, since it is larger than the sum of its proper divisors (5073794979).

11121021021 is a wasteful number, since it uses less digits than its factorization.

11121021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391376.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11121021021 its reverse (12012012111), we get a palindrome (23133033132).

It can be divided in two parts, 111210 and 21021, that added together give a palindrome (132231).

The spelling of 11121021021 in words is "eleven billion, one hundred twenty-one million, twenty-one thousand, twenty-one".