11011112121021 has 4 divisors (see below), whose sum is σ = 14681482828032. Its totient is φ = 7340741414012.

The previous prime is 11011112120927. The next prime is 11011112121127. The reversal of 11011112121021 is 12012121111011.

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 11011112121021 - 2²¹ = 11011110023869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011112121421) 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, 1835185353501 + ... + 1835185353506.

It is an arithmetic number, because the mean of its divisors is an integer number (3670370707008).

Almost surely, 2^{11011112121021} is an apocalyptic number.

It is an amenable number.

11011112121021 is a deficient number, since it is larger than the sum of its proper divisors (3670370707011).

11011112121021 is an equidigital number, since it uses as much as digits as its factorization.

11011112121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670370707010.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 11011112121021 its reverse (12012121111011), we get a palindrome (23023233232032).

The spelling of 11011112121021 in words is "eleven trillion, eleven billion, one hundred twelve million, one hundred twenty-one thousand, twenty-one".