21344267 has 4 divisors (see below), whose sum is σ = 24393456. Its totient is φ = 18295080.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344267 is 76244312.

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

It is a cyclic number.

It is not a de Polignac number, because 21344267 - 2¹⁰ = 21343243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344237) 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, 1524584 + ... + 1524597.

It is an arithmetic number, because the mean of its divisors is an integer number (6098364).

Almost surely, 2^21344267 is an apocalyptic number.

21344267 is a deficient number, since it is larger than the sum of its proper divisors (3049189).

21344267 is an equidigital number, since it uses as much as digits as its factorization.

21344267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049188.

The product of its digits is 8064, while the sum is 29.

The square root of 21344267 is about 4619.9856060382. The cubic root of 21344267 is about 277.3918827796.

Adding to 21344267 its reverse (76244312), we get a palindrome (97588579).

It can be divided in two parts, 2134 and 4267, that multiplied together give a triangular number (9105778 = T₄₂₆₇).

The spelling of 21344267 in words is "twenty-one million, three hundred forty-four thousand, two hundred sixty-seven".