21010007 has 8 divisors (see below), whose sum is σ = 21826800. Its totient is φ = 20199424.

The previous prime is 21009997. The next prime is 21010013. The reversal of 21010007 is 70001012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010037) 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 7 ways as a sum of consecutive naturals, for example, 6044 + ... + 8862.

It is an arithmetic number, because the mean of its divisors is an integer number (2728350).

Almost surely, 2^21010007 is an apocalyptic number.

21010007 is a deficient number, since it is larger than the sum of its proper divisors (816793).

21010007 is a wasteful number, since it uses less digits than its factorization.

21010007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105.

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 21010007 is about 4583.6674181271. The cubic root of 21010007 is about 275.9362337810.

Adding to 21010007 its reverse (70001012), we get a palindrome (91011019).

The spelling of 21010007 in words is "twenty-one million, ten thousand, seven".