22220421 has 4 divisors (see below), whose sum is σ = 29627232. Its totient is φ = 14813612.

The previous prime is 22220417. The next prime is 22220431. The reversal of 22220421 is 12402222.

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 a cyclic number.

It is not a de Polignac number, because 22220421 - 2² = 22220417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22220421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3703401 + ... + 3703406.

It is an arithmetic number, because the mean of its divisors is an integer number (7406808).

Almost surely, 2^22220421 is an apocalyptic number.

It is an amenable number.

22220421 is a deficient number, since it is larger than the sum of its proper divisors (7406811).

22220421 is an equidigital number, since it uses as much as digits as its factorization.

22220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406810.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22220421 is about 4713.8541555716. The cubic root of 22220421 is about 281.1366255137.

Adding to 22220421 its reverse (12402222), we get a palindrome (34622643).

The spelling of 22220421 in words is "twenty-two million, two hundred twenty thousand, four hundred twenty-one".