21434361 has 16 divisors (see below), whose sum is σ = 31772160. Its totient is φ = 12764160.

The previous prime is 21434353. The next prime is 21434383. The reversal of 21434361 is 16343412.

It is not a de Polignac number, because 21434361 - 2³ = 21434353 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21434341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7656 + ... + 10073.

It is an arithmetic number, because the mean of its divisors is an integer number (1985760).

Almost surely, 2^21434361 is an apocalyptic number.

It is an amenable number.

21434361 is a deficient number, since it is larger than the sum of its proper divisors (10337799).

21434361 is a wasteful number, since it uses less digits than its factorization.

21434361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17776.

The product of its digits is 1728, while the sum is 24.

The square root of 21434361 is about 4629.7258018159. The cubic root of 21434361 is about 277.7816246519.

Adding to 21434361 its reverse (16343412), we get a palindrome (37777773).

The spelling of 21434361 in words is "twenty-one million, four hundred thirty-four thousand, three hundred sixty-one".