11031221221 has 4 divisors (see below), whose sum is σ = 11032993312. Its totient is φ = 11029449132.

The previous prime is 11031221207. The next prime is 11031221249. The reversal of 11031221221 is 12212213011.

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 not a de Polignac number, because 11031221221 - 2¹⁵ = 11031188453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11031221195 and 11031221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11031221281) 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, 876675 + ... + 889168.

It is an arithmetic number, because the mean of its divisors is an integer number (2758248328).

Almost surely, 2^11031221221 is an apocalyptic number.

It is an amenable number.

11031221221 is a deficient number, since it is larger than the sum of its proper divisors (1772091).

11031221221 is an equidigital number, since it uses as much as digits as its factorization.

11031221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772090.

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

Adding to 11031221221 its reverse (12212213011), we get a palindrome (23243434232).

The spelling of 11031221221 in words is "eleven billion, thirty-one million, two hundred twenty-one thousand, two hundred twenty-one".