21470210 has 8 divisors (see below), whose sum is σ = 38646396. Its totient is φ = 8588080.

The previous prime is 21470149. The next prime is 21470219. The reversal of 21470210 is 1207412.

It can be written as a sum of positive squares in 2 ways, for example, as 20802721 + 667489 = 4561^2 + 817^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21470219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073501 + ... + 1073520.

Almost surely, 2^21470210 is an apocalyptic number.

21470210 is a deficient number, since it is larger than the sum of its proper divisors (17176186).

21470210 is a wasteful number, since it uses less digits than its factorization.

21470210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147028.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21470210 is about 4633.5957959235. The cubic root of 21470210 is about 277.9364017863.

Adding to 21470210 its reverse (1207412), we get a palindrome (22677622).

The spelling of 21470210 in words is "twenty-one million, four hundred seventy thousand, two hundred ten".