22420221 has 8 divisors (see below), whose sum is σ = 29918880. Its totient is φ = 14934192.

The previous prime is 22420213. The next prime is 22420241. The reversal of 22420221 is 12202422.

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

It is not a de Polignac number, because 22420221 - 2³ = 22420213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22420221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22420201) 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, 2371 + ... + 7103.

It is an arithmetic number, because the mean of its divisors is an integer number (3739860).

Almost surely, 2^22420221 is an apocalyptic number.

It is an amenable number.

22420221 is a deficient number, since it is larger than the sum of its proper divisors (7498659).

22420221 is a wasteful number, since it uses less digits than its factorization.

22420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6315.

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

The square root of 22420221 is about 4734.9995776135. Note that the first 3 decimals coincide. The cubic root of 22420221 is about 281.9767472402.

Adding to 22420221 its reverse (12202422), we get a palindrome (34622643).

The spelling of 22420221 in words is "twenty-two million, four hundred twenty thousand, two hundred twenty-one".