11002121221 has 32 divisors (see below), whose sum is σ = 13654269440. Its totient is φ = 8683863552.

The previous prime is 11002121213. The next prime is 11002121227. The reversal of 11002121221 is 12212120011.

It is not a de Polignac number, because 11002121221 - 2³ = 11002121213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11002121227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10349536 + ... + 10350598.

It is an arithmetic number, because the mean of its divisors is an integer number (426695920).

Almost surely, 2^11002121221 is an apocalyptic number.

It is an amenable number.

11002121221 is a deficient number, since it is larger than the sum of its proper divisors (2652148219).

11002121221 is an equidigital number, since it uses as much as digits as its factorization.

11002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1756 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11002121221 its reverse (12212120011), we get a palindrome (23214241232).

The spelling of 11002121221 in words is "eleven billion, two million, one hundred twenty-one thousand, two hundred twenty-one".