21134534 has 4 divisors (see below), whose sum is σ = 31701804. Its totient is φ = 10567266.

The previous prime is 21134527. The next prime is 21134569. The reversal of 21134534 is 43543112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283632 + ... + 5283635.

It is an arithmetic number, because the mean of its divisors is an integer number (7925451).

Almost surely, 2^21134534 is an apocalyptic number.

21134534 is a deficient number, since it is larger than the sum of its proper divisors (10567270).

21134534 is a wasteful number, since it uses less digits than its factorization.

21134534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10567269.

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

The square root of 21134534 is about 4597.2311231871. The cubic root of 21134534 is about 276.4803212846.

Adding to 21134534 its reverse (43543112), we get a palindrome (64677646).

The spelling of 21134534 in words is "twenty-one million, one hundred thirty-four thousand, five hundred thirty-four".