21120459 has 8 divisors (see below), whose sum is σ = 28434432. Its totient is φ = 13943400.

The previous prime is 21120431. The next prime is 21120461. The reversal of 21120459 is 95402112.

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

It is not a de Polignac number, because 21120459 - 2⁵ = 21120427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120469) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 33867 + ... + 34484.

It is an arithmetic number, because the mean of its divisors is an integer number (3554304).

Almost surely, 2^21120459 is an apocalyptic number.

21120459 is a deficient number, since it is larger than the sum of its proper divisors (7313973).

21120459 is a wasteful number, since it uses less digits than its factorization.

21120459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68457.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 21120459 is about 4595.7000554867. The cubic root of 21120459 is about 276.4189316381.

The spelling of 21120459 in words is "twenty-one million, one hundred twenty thousand, four hundred fifty-nine".