21013007 has 8 divisors (see below), whose sum is σ = 22041600. Its totient is φ = 19994040.

The previous prime is 21012997. The next prime is 21013019. The reversal of 21013007 is 70031012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013007 - 2⁴ = 21012991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012982 and 21013000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2282 + ... + 6872.

It is an arithmetic number, because the mean of its divisors is an integer number (2755200).

Almost surely, 2^21013007 is an apocalyptic number.

21013007 is a deficient number, since it is larger than the sum of its proper divisors (1028593).

21013007 is a wasteful number, since it uses less digits than its factorization.

21013007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4813.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 21013007 is about 4583.9946553197. The cubic root of 21013007 is about 275.9493667181.

Adding to 21013007 its reverse (70031012), we get a palindrome (91044019).

The spelling of 21013007 in words is "twenty-one million, thirteen thousand, seven".