11221421 has 4 divisors (see below), whose sum is σ = 11264352. Its totient is φ = 11178492.

The previous prime is 11221417. The next prime is 11221423. The reversal of 11221421 is 12412211.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12412211 = 7 ⋅1773173.

It is a cyclic number.

It is not a de Polignac number, because 11221421 - 2² = 11221417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11221396 and 11221405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221423) 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, 21071 + ... + 21596.

It is an arithmetic number, because the mean of its divisors is an integer number (2816088).

Almost surely, 2^11221421 is an apocalyptic number.

It is an amenable number.

11221421 is a deficient number, since it is larger than the sum of its proper divisors (42931).

11221421 is an equidigital number, since it uses as much as digits as its factorization.

11221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42930.

The product of its digits is 32, while the sum is 14.

The square root of 11221421 is about 3349.8389513527. The cubic root of 11221421 is about 223.8803370748.

Adding to 11221421 its reverse (12412211), we get a palindrome (23633632).

The spelling of 11221421 in words is "eleven million, two hundred twenty-one thousand, four hundred twenty-one".