21013310 has 16 divisors (see below), whose sum is σ = 37891152. Its totient is φ = 8390400.

The previous prime is 21013303. The next prime is 21013357. The reversal of 21013310 is 1331012.

It is a super-2 number, since 2×21013310² = 883118394312200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21013291 and 21013300.

It is a congruent number.

It is an unprimeable number.

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, 5390 + ... + 8430.

It is an arithmetic number, because the mean of its divisors is an integer number (2368197).

Almost surely, 2^21013310 is an apocalyptic number.

21013310 is a deficient number, since it is larger than the sum of its proper divisors (16877842).

21013310 is a wasteful number, since it uses less digits than its factorization.

21013310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21013310 is about 4584.0277049774. The cubic root of 21013310 is about 275.9506930753.

Adding to 21013310 its reverse (1331012), we get a palindrome (22344322).

The spelling of 21013310 in words is "twenty-one million, thirteen thousand, three hundred ten".