21433210 has 16 divisors (see below), whose sum is σ = 38963592. Its totient is φ = 8488000.

The previous prime is 21433207. The next prime is 21433213. The reversal of 21433210 is 1233412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21433207) and next prime (21433213).

It can be written as a sum of positive squares in 4 ways, for example, as 21095649 + 337561 = 4593^2 + 581^2 .

It is not an unprimeable number, because it can be changed into a prime (21433213) 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 7 ways as a sum of consecutive naturals, for example, 9601 + ... + 11620.

Almost surely, 2^21433210 is an apocalyptic number.

21433210 is a deficient number, since it is larger than the sum of its proper divisors (17530382).

21433210 is a wasteful number, since it uses less digits than its factorization.

21433210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21329.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21433210 is about 4629.6014947293. The cubic root of 21433210 is about 277.7766523806.

Adding to 21433210 its reverse (1233412), we get a palindrome (22666622).

The spelling of 21433210 in words is "twenty-one million, four hundred thirty-three thousand, two hundred ten".