21034534 has 8 divisors (see below), whose sum is σ = 32147280. Its totient is φ = 10318776.

The previous prime is 21034513. The next prime is 21034543. The reversal of 21034534 is 43543012.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99114 + ... + 99325.

It is an arithmetic number, because the mean of its divisors is an integer number (4018410).

Almost surely, 2^21034534 is an apocalyptic number.

21034534 is a deficient number, since it is larger than the sum of its proper divisors (11112746).

21034534 is a wasteful number, since it uses less digits than its factorization.

21034534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198494.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21034534 is about 4586.3421154554. The cubic root of 21034534 is about 276.0435676515.

Adding to 21034534 its reverse (43543012), we get a palindrome (64577546).

The spelling of 21034534 in words is "twenty-one million, thirty-four thousand, five hundred thirty-four".