11212012021 has 16 divisors (see below), whose sum is σ = 13014719104. Its totient is φ = 9459768384.

The previous prime is 11212012001. The next prime is 11212012033. The reversal of 11212012021 is 12021021211.

It is a cyclic number.

It is not a de Polignac number, because 11212012021 - 2⁹ = 11212011509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212011992 and 11212012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212012001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 673231 + ... + 689683.

It is an arithmetic number, because the mean of its divisors is an integer number (813419944).

Almost surely, 2^11212012021 is an apocalyptic number.

It is an amenable number.

11212012021 is a deficient number, since it is larger than the sum of its proper divisors (1802707083).

11212012021 is a wasteful number, since it uses less digits than its factorization.

11212012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17980.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11212012021 its reverse (12021021211), we get a palindrome (23233033232).

The spelling of 11212012021 in words is "eleven billion, two hundred twelve million, twelve thousand, twenty-one".