21234495 has 16 divisors (see below), whose sum is σ = 35763840. Its totient is φ = 10728864.

The previous prime is 21234487. The next prime is 21234509. The reversal of 21234495 is 59443212.

It is not a de Polignac number, because 21234495 - 2³ = 21234487 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 36969 + ... + 37538.

It is an arithmetic number, because the mean of its divisors is an integer number (2235240).

Almost surely, 2^21234495 is an apocalyptic number.

21234495 is a deficient number, since it is larger than the sum of its proper divisors (14529345).

21234495 is a wasteful number, since it uses less digits than its factorization.

21234495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74534.

The product of its digits is 8640, while the sum is 30.

The square root of 21234495 is about 4608.0901683886. The cubic root of 21234495 is about 276.9155298572.

The spelling of 21234495 in words is "twenty-one million, two hundred thirty-four thousand, four hundred ninety-five".