21422245 has 16 divisors (see below), whose sum is σ = 28103040. Its totient is φ = 15580224.

The previous prime is 21422231. The next prime is 21422273. The reversal of 21422245 is 54222412.

It is a cyclic number.

It is not a de Polignac number, because 21422245 - 2⁷ = 21422117 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1896 + ... + 6814.

It is an arithmetic number, because the mean of its divisors is an integer number (1756440).

Almost surely, 2^21422245 is an apocalyptic number.

It is an amenable number.

21422245 is a deficient number, since it is larger than the sum of its proper divisors (6680795).

21422245 is a wasteful number, since it uses less digits than its factorization.

21422245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004.

The product of its digits is 1280, while the sum is 22.

The square root of 21422245 is about 4628.4171160344. The cubic root of 21422245 is about 277.7292751166.

Adding to 21422245 its reverse (54222412), we get a palindrome (75644657).

The spelling of 21422245 in words is "twenty-one million, four hundred twenty-two thousand, two hundred forty-five".