21754893 has 16 divisors (see below), whose sum is σ = 29851200. Its totient is φ = 14087040.

The previous prime is 21754891. The next prime is 21754961. The reversal of 21754893 is 39845712.

It is not a de Polignac number, because 21754893 - 2¹ = 21754891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21754891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15063 + ... + 16443.

It is an arithmetic number, because the mean of its divisors is an integer number (1865700).

Almost surely, 2^21754893 is an apocalyptic number.

It is an amenable number.

21754893 is a deficient number, since it is larger than the sum of its proper divisors (8096307).

21754893 is a wasteful number, since it uses less digits than its factorization.

21754893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532.

The product of its digits is 60480, while the sum is 39.

The square root of 21754893 is about 4664.2140817077. The cubic root of 21754893 is about 279.1594391931.

The spelling of 21754893 in words is "twenty-one million, seven hundred fifty-four thousand, eight hundred ninety-three".