21367305 has 48 divisors (see below), whose sum is σ = 39673920. Its totient is φ = 10606464.

The previous prime is 21367289. The next prime is 21367309. The reversal of 21367305 is 50376312.

It is a happy number.

It is not a de Polignac number, because 21367305 - 2⁴ = 21367289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21367309) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57099 + ... + 57471.

It is an arithmetic number, because the mean of its divisors is an integer number (826540).

Almost surely, 2^21367305 is an apocalyptic number.

It is an amenable number.

21367305 is a deficient number, since it is larger than the sum of its proper divisors (18306615).

21367305 is a wasteful number, since it uses less digits than its factorization.

21367305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 21367305 is about 4622.4782314252. The cubic root of 21367305 is about 277.4916481538.

The spelling of 21367305 in words is "twenty-one million, three hundred sixty-seven thousand, three hundred five".