11212321021 has 24 divisors (see below), whose sum is σ = 12925519488. Its totient is φ = 9644400000.

The previous prime is 11212321007. The next prime is 11212321027. The reversal of 11212321021 is 12012321211.

It is not a de Polignac number, because 11212321021 - 2⁵ = 11212320989 is a prime.

It is a super-2 number, since 2×11212321021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212320986 and 11212321004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212321027) 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 23 ways as a sum of consecutive naturals, for example, 4767996 + ... + 4770346.

It is an arithmetic number, because the mean of its divisors is an integer number (538563312).

Almost surely, 2^11212321021 is an apocalyptic number.

11212321021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11212321021 is a deficient number, since it is larger than the sum of its proper divisors (1713198467).

11212321021 is a wasteful number, since it uses less digits than its factorization.

11212321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601 (or 3582 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11212321021 its reverse (12012321211), we get a palindrome (23224642232).

It can be divided in two parts, 11212 and 321021, that added together give a palindrome (332233).

The spelling of 11212321021 in words is "eleven billion, two hundred twelve million, three hundred twenty-one thousand, twenty-one".