11211210021 has 32 divisors (see below), whose sum is σ = 16943529600. Its totient is φ = 6531598080.

The previous prime is 11211210019. The next prime is 11211210037. The reversal of 11211210021 is 12001211211.

It is not a de Polignac number, because 11211210021 - 2¹ = 11211210019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211209979 and 11211210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211210721) 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 31 ways as a sum of consecutive naturals, for example, 193575 + ... + 244731.

It is an arithmetic number, because the mean of its divisors is an integer number (529485300).

Almost surely, 2^11211210021 is an apocalyptic number.

11211210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211210021 is a deficient number, since it is larger than the sum of its proper divisors (5732319579).

11211210021 is a wasteful number, since it uses less digits than its factorization.

11211210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51429.

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

Adding to 11211210021 its reverse (12001211211), we get a palindrome (23212421232).

The spelling of 11211210021 in words is "eleven billion, two hundred eleven million, two hundred ten thousand, twenty-one".