11220001 has 8 divisors (see below), whose sum is σ = 12122600. Its totient is φ = 10323072.

The previous prime is 11219987. The next prime is 11220007. The reversal of 11220001 is 10002211.

It can be written as a sum of positive squares in 4 ways, for example, as 2099601 + 9120400 = 1449^2 + 3020^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11220001 - 2²³ = 2831393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11220007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3301 + ... + 5773.

It is an arithmetic number, because the mean of its divisors is an integer number (1515325).

Almost surely, 2^11220001 is an apocalyptic number.

It is an amenable number.

11220001 is a deficient number, since it is larger than the sum of its proper divisors (902599).

11220001 is a wasteful number, since it uses less digits than its factorization.

11220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 11220001 is about 3349.6269941592. The cubic root of 11220001 is about 223.8708931286.

Adding to 11220001 its reverse (10002211), we get a palindrome (21222212).

The spelling of 11220001 in words is "eleven million, two hundred twenty thousand, one".