21434367 has 8 divisors (see below), whose sum is σ = 29821824. Its totient is φ = 13668248.

The previous prime is 21434353. The next prime is 21434383. The reversal of 21434367 is 76343412.

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

It is a cyclic number.

It is not a de Polignac number, because 21434367 - 2¹⁸ = 21172223 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434327) 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 7 ways as a sum of consecutive naturals, for example, 155253 + ... + 155390.

It is an arithmetic number, because the mean of its divisors is an integer number (3727728).

Almost surely, 2^21434367 is an apocalyptic number.

21434367 is a deficient number, since it is larger than the sum of its proper divisors (8387457).

21434367 is a wasteful number, since it uses less digits than its factorization.

21434367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310669.

The product of its digits is 12096, while the sum is 30.

The square root of 21434367 is about 4629.7264498024. The cubic root of 21434367 is about 277.7816505712.

Adding to 21434367 its reverse (76343412), we get a palindrome (97777779).

The spelling of 21434367 in words is "twenty-one million, four hundred thirty-four thousand, three hundred sixty-seven".