11002221 has 12 divisors (see below), whose sum is σ = 15922140. Its totient is φ = 7320960.

The previous prime is 11002219. The next prime is 11002249. The reversal of 11002221 is 12220011.

It can be written as a sum of positive squares in 2 ways, for example, as 2673225 + 8328996 = 1635^2 + 2886^2 .

It is not a de Polignac number, because 11002221 - 2¹ = 11002219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11002291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6645 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (1326845).

Almost surely, 2^11002221 is an apocalyptic number.

It is an amenable number.

11002221 is a deficient number, since it is larger than the sum of its proper divisors (4919919).

11002221 is a wasteful number, since it uses less digits than its factorization.

11002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316 (or 2313 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 11002221 is about 3316.9596018040. The cubic root of 11002221 is about 222.4129761096.

Adding to 11002221 its reverse (12220011), we get a palindrome (23222232).

It can be divided in two parts, 1100 and 2221, that added together give a triangular number (3321 = T₈₁).

The spelling of 11002221 in words is "eleven million, two thousand, two hundred twenty-one".