11121312021 has 16 divisors (see below), whose sum is σ = 14945548800. Its totient is φ = 7355716848.

The previous prime is 11121312011. The next prime is 11121312071. The reversal of 11121312021 is 12021312111.

It is not a de Polignac number, because 11121312021 - 2¹⁷ = 11121180949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121312001) 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, 641550 + ... + 658656.

It is an arithmetic number, because the mean of its divisors is an integer number (934096800).

Almost surely, 2^11121312021 is an apocalyptic number.

It is an amenable number.

11121312021 is a deficient number, since it is larger than the sum of its proper divisors (3824236779).

11121312021 is a wasteful number, since it uses less digits than its factorization.

11121312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18808.

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

Adding to 11121312021 its reverse (12021312111), we get a palindrome (23142624132).

The spelling of 11121312021 in words is "eleven billion, one hundred twenty-one million, three hundred twelve thousand, twenty-one".