21165134 has 8 divisors (see below), whose sum is σ = 32423328. Its totient is φ = 10357360.

The previous prime is 21165121. The next prime is 21165149. The reversal of 21165134 is 43156112.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112487 + ... + 112674.

It is an arithmetic number, because the mean of its divisors is an integer number (4052916).

Almost surely, 2^21165134 is an apocalyptic number.

21165134 is a deficient number, since it is larger than the sum of its proper divisors (11258194).

21165134 is a wasteful number, since it uses less digits than its factorization.

21165134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225210.

The product of its digits is 720, while the sum is 23.

The square root of 21165134 is about 4600.5580096332. The cubic root of 21165134 is about 276.6136925398.

The spelling of 21165134 in words is "twenty-one million, one hundred sixty-five thousand, one hundred thirty-four".