21363310 has 16 divisors (see below), whose sum is σ = 39106800. Its totient is φ = 8400256.

The previous prime is 21363301. The next prime is 21363311. The reversal of 21363310 is 1336312.

It is a super-2 number, since 2×21363310² = 912782028312200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363311) 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, 17515 + ... + 18694.

It is an arithmetic number, because the mean of its divisors is an integer number (2444175).

Almost surely, 2^21363310 is an apocalyptic number.

21363310 is a deficient number, since it is larger than the sum of its proper divisors (17743490).

21363310 is a wasteful number, since it uses less digits than its factorization.

21363310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36275.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 21363310 is about 4622.0460837166. The cubic root of 21363310 is about 277.4743530663.

Adding to 21363310 its reverse (1336312), we get a palindrome (22699622).

The spelling of 21363310 in words is "twenty-one million, three hundred sixty-three thousand, three hundred ten".