21222435 has 32 divisors (see below), whose sum is σ = 37433088. Its totient is φ = 10200960.

The previous prime is 21222433. The next prime is 21222469. The reversal of 21222435 is 53422212.

It is not a de Polignac number, because 21222435 - 2¹ = 21222433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222433) 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 31 ways as a sum of consecutive naturals, for example, 7120 + ... + 9650.

It is an arithmetic number, because the mean of its divisors is an integer number (1169784).

Almost surely, 2^21222435 is an apocalyptic number.

21222435 is a deficient number, since it is larger than the sum of its proper divisors (16210653).

21222435 is a wasteful number, since it uses less digits than its factorization.

21222435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595.

The product of its digits is 960, while the sum is 21.

The square root of 21222435 is about 4606.7814143934. The cubic root of 21222435 is about 276.8630957757.

Adding to 21222435 its reverse (53422212), we get a palindrome (74644647).

The spelling of 21222435 in words is "twenty-one million, two hundred twenty-two thousand, four hundred thirty-five".