21013010 has 16 divisors (see below), whose sum is σ = 37884672. Its totient is φ = 8391600.

The previous prime is 21012997. The next prime is 21013019. The reversal of 21013010 is 1031012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21013019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6815 + ... + 9405.

It is an arithmetic number, because the mean of its divisors is an integer number (2367792).

Almost surely, 2^21013010 is an apocalyptic number.

21013010 is a deficient number, since it is larger than the sum of its proper divisors (16871662).

21013010 is a wasteful number, since it uses less digits than its factorization.

21013010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 21013010 is about 4583.9949825452. The cubic root of 21013010 is about 275.9493798504.

Adding to 21013010 its reverse (1031012), we get a palindrome (22044022).

The spelling of 21013010 in words is "twenty-one million, thirteen thousand, ten".