21434513 has 8 divisors (see below), whose sum is σ = 22034376. Its totient is φ = 20838400.

The previous prime is 21434471. The next prime is 21434531. The reversal of 21434513 is 31543412.

It can be written as a sum of positive squares in 4 ways, for example, as 16129 + 21418384 = 127^2 + 4628^2 .

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 21434513 - 2⁶ = 21434449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21434213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13733 + ... + 15213.

It is an arithmetic number, because the mean of its divisors is an integer number (2754297).

Almost surely, 2^21434513 is an apocalyptic number.

It is an amenable number.

21434513 is a deficient number, since it is larger than the sum of its proper divisors (599863).

21434513 is a wasteful number, since it uses less digits than its factorization.

21434513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875.

The product of its digits is 1440, while the sum is 23.

The square root of 21434513 is about 4629.7422174458. The cubic root of 21434513 is about 277.7822812722.

Adding to 21434513 its reverse (31543412), we get a palindrome (52977925).

The spelling of 21434513 in words is "twenty-one million, four hundred thirty-four thousand, five hundred thirteen".