11420404221 has 4 divisors (see below), whose sum is σ = 15227205632. Its totient is φ = 7613602812.

The previous prime is 11420404139. The next prime is 11420404231. The reversal of 11420404221 is 12240402411.

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 not a de Polignac number, because 11420404221 - 2³⁰ = 10346662397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11420404231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1903400701 + ... + 1903400706.

It is an arithmetic number, because the mean of its divisors is an integer number (3806801408).

Almost surely, 2^11420404221 is an apocalyptic number.

It is an amenable number.

11420404221 is a deficient number, since it is larger than the sum of its proper divisors (3806801411).

11420404221 is an equidigital number, since it uses as much as digits as its factorization.

11420404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806801410.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 11420404221 its reverse (12240402411), we get a palindrome (23660806632).

The spelling of 11420404221 in words is "eleven billion, four hundred twenty million, four hundred four thousand, two hundred twenty-one".