21367436 has 12 divisors (see below), whose sum is σ = 39592728. Its totient is φ = 10055232.

The previous prime is 21367433. The next prime is 21367481. The reversal of 21367436 is 63476312.

It is not an unprimeable number, because it can be changed into a prime (21367433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157046 + ... + 157181.

It is an arithmetic number, because the mean of its divisors is an integer number (3299394).

Almost surely, 2^21367436 is an apocalyptic number.

It is an amenable number.

21367436 is a deficient number, since it is larger than the sum of its proper divisors (18225292).

21367436 is a wasteful number, since it uses less digits than its factorization.

21367436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314248 (or 314246 counting only the distinct ones).

The product of its digits is 18144, while the sum is 32.

The square root of 21367436 is about 4622.4924012918. The cubic root of 21367436 is about 277.4922152403.

The spelling of 21367436 in words is "twenty-one million, three hundred sixty-seven thousand, four hundred thirty-six".