11122211021 has 4 divisors (see below), whose sum is σ = 11122769952. Its totient is φ = 11121652092.

The previous prime is 11122211011. The next prime is 11122211041. The reversal of 11122211021 is 12011222111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11122211021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11122210987 and 11122211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122211011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248471 + ... + 289796.

It is an arithmetic number, because the mean of its divisors is an integer number (2780692488).

Almost surely, 2^11122211021 is an apocalyptic number.

It is an amenable number.

11122211021 is a deficient number, since it is larger than the sum of its proper divisors (558931).

11122211021 is an equidigital number, since it uses as much as digits as its factorization.

11122211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558930.

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

Adding to 11122211021 its reverse (12011222111), we get a palindrome (23133433132).

The spelling of 11122211021 in words is "eleven billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".