21010670 has 8 divisors (see below), whose sum is σ = 37819224. Its totient is φ = 8404264.

The previous prime is 21010663. The next prime is 21010673. The reversal of 21010670 is 7601012.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010673) 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, 1050524 + ... + 1050543.

It is an arithmetic number, because the mean of its divisors is an integer number (4727403).

Almost surely, 2^21010670 is an apocalyptic number.

21010670 is a deficient number, since it is larger than the sum of its proper divisors (16808554).

21010670 is a wasteful number, since it uses less digits than its factorization.

21010670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101074.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21010670 is about 4583.7397395576. The cubic root of 21010670 is about 275.9391362677.

Adding to 21010670 its reverse (7601012), we get a palindrome (28611682).

The spelling of 21010670 in words is "twenty-one million, ten thousand, six hundred seventy".