21422504 has 16 divisors (see below), whose sum is σ = 40566420. Its totient is φ = 10604800.

The previous prime is 21422501. The next prime is 21422537. The reversal of 21422504 is 40522412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21141604 + 280900 = 4598^2 + 530^2 .

It is not an unprimeable number, because it can be changed into a prime (21422501) 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, 12449 + ... + 14064.

Almost surely, 2^21422504 is an apocalyptic number.

It is an amenable number.

21422504 is a deficient number, since it is larger than the sum of its proper divisors (19143916).

21422504 is a wasteful number, since it uses less digits than its factorization.

21422504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26620 (or 26616 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 21422504 is about 4628.4450952777. The cubic root of 21422504 is about 277.7303943830.

Adding to 21422504 its reverse (40522412), we get a palindrome (61944916).

It can be divided in two parts, 214 and 22504, that multiplied together give a triangular number (4815856 = T₃₁₀₃).

The spelling of 21422504 in words is "twenty-one million, four hundred twenty-two thousand, five hundred four".