21363207 has 8 divisors (see below), whose sum is σ = 28566384. Its totient is φ = 14201088.

The previous prime is 21363193. The next prime is 21363253. The reversal of 21363207 is 70236312.

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

It is not a de Polignac number, because 21363207 - 2⁴ = 21363191 is a prime.

It is a super-2 number, since 2×21363207² = 912773226649698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9028 + ... + 11145.

It is an arithmetic number, because the mean of its divisors is an integer number (3570798).

Almost surely, 2^21363207 is an apocalyptic number.

21363207 is a deficient number, since it is larger than the sum of its proper divisors (7203177).

21363207 is a wasteful number, since it uses less digits than its factorization.

21363207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20529.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 21363207 is about 4622.0349414517. The cubic root of 21363207 is about 277.4739071319.

Adding to 21363207 its reverse (70236312), we get a palindrome (91599519).

The spelling of 21363207 in words is "twenty-one million, three hundred sixty-three thousand, two hundred seven".