22221407 has 4 divisors (see below), whose sum is σ = 23930760. Its totient is φ = 20512056.

The previous prime is 22221391. The next prime is 22221449. The reversal of 22221407 is 70412222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22221407 - 2⁴ = 22221391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854657 + ... + 854682.

It is an arithmetic number, because the mean of its divisors is an integer number (5982690).

Almost surely, 2^22221407 is an apocalyptic number.

22221407 is a deficient number, since it is larger than the sum of its proper divisors (1709353).

22221407 is a wasteful number, since it uses less digits than its factorization.

22221407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709352.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 22221407 is about 4713.9587397431. The cubic root of 22221407 is about 281.1407838000.

Adding to 22221407 its reverse (70412222), we get a palindrome (92633629).

The spelling of 22221407 in words is "twenty-two million, two hundred twenty-one thousand, four hundred seven".