21434369 has 8 divisors (see below), whose sum is σ = 23486112. Its totient is φ = 19399840.

The previous prime is 21434353. The next prime is 21434383. The reversal of 21434369 is 96343412.

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 21434369 - 2⁴ = 21434353 is a prime.

It is a super-2 number, since 2×21434369² = 918864348856322, which contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1619 + ... + 6744.

It is an arithmetic number, because the mean of its divisors is an integer number (2935764).

Almost surely, 2^21434369 is an apocalyptic number.

It is an amenable number.

21434369 is a deficient number, since it is larger than the sum of its proper divisors (2051743).

21434369 is a wasteful number, since it uses less digits than its factorization.

21434369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8607.

The product of its digits is 15552, while the sum is 32.

The square root of 21434369 is about 4629.7266657979. The cubic root of 21434369 is about 277.7816592109.

It can be divided in two parts, 214343 and 69, that added together give a palindrome (214412).

The spelling of 21434369 in words is "twenty-one million, four hundred thirty-four thousand, three hundred sixty-nine".