21452210 has 32 divisors (see below), whose sum is σ = 42481152. Its totient is φ = 7750080.

The previous prime is 21452209. The next prime is 21452219. The reversal of 21452210 is 1225412.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21452219) 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 15 ways as a sum of consecutive naturals, for example, 4355 + ... + 7865.

It is an arithmetic number, because the mean of its divisors is an integer number (1327536).

Almost surely, 2^21452210 is an apocalyptic number.

21452210 is a deficient number, since it is larger than the sum of its proper divisors (21028942).

21452210 is a wasteful number, since it uses less digits than its factorization.

21452210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21452210 is about 4631.6530526368. The cubic root of 21452210 is about 277.8587088035.

Adding to 21452210 its reverse (1225412), we get a palindrome (22677622).

The spelling of 21452210 in words is "twenty-one million, four hundred fifty-two thousand, two hundred ten".