11021121221 has 8 divisors (see below), whose sum is σ = 12024842688. Its totient is φ = 10017700000.

The previous prime is 11021121211. The next prime is 11021121229. The reversal of 11021121221 is 12212112011.

11021121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11021121221 - 2¹⁴ = 11021104837 is a prime.

It is a super-2 number, since 2×11021121221² (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 = 11021121196 and 11021121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021121229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5456 + ... + 148566.

It is an arithmetic number, because the mean of its divisors is an integer number (1503105336).

Almost surely, 2^11021121221 is an apocalyptic number.

11021121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11021121221 is a deficient number, since it is larger than the sum of its proper divisors (1003721467).

11021121221 is a wasteful number, since it uses less digits than its factorization.

11021121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150123.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11021121221 its reverse (12212112011), we get a palindrome (23233233232).

The spelling of 11021121221 in words is "eleven billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".