21364467 has 4 divisors (see below), whose sum is σ = 28485960. Its totient is φ = 14242976.

The previous prime is 21364463. The next prime is 21364471. The reversal of 21364467 is 76446312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21364463) and next prime (21364471).

It is a cyclic number.

It is not a de Polignac number, because 21364467 - 2² = 21364463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21364463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560742 + ... + 3560747.

It is an arithmetic number, because the mean of its divisors is an integer number (7121490).

Almost surely, 2^21364467 is an apocalyptic number.

21364467 is a deficient number, since it is larger than the sum of its proper divisors (7121493).

21364467 is an equidigital number, since it uses as much as digits as its factorization.

21364467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7121492.

The product of its digits is 24192, while the sum is 33.

The square root of 21364467 is about 4622.1712430415. The cubic root of 21364467 is about 277.4793621532.

The spelling of 21364467 in words is "twenty-one million, three hundred sixty-four thousand, four hundred sixty-seven".