21754389 has 8 divisors (see below), whose sum is σ = 30267072. Its totient is φ = 13872320.

The previous prime is 21754387. The next prime is 21754417. The reversal of 21754389 is 98345712.

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

It is a cyclic number.

It is not a de Polignac number, because 21754389 - 2¹ = 21754387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21754387) 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 7 ways as a sum of consecutive naturals, for example, 157572 + ... + 157709.

It is an arithmetic number, because the mean of its divisors is an integer number (3783384).

Almost surely, 2^21754389 is an apocalyptic number.

It is an amenable number.

21754389 is a deficient number, since it is larger than the sum of its proper divisors (8512683).

21754389 is a wasteful number, since it uses less digits than its factorization.

21754389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315307.

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

The square root of 21754389 is about 4664.1600529999. The cubic root of 21754389 is about 279.1572833954.

The spelling of 21754389 in words is "twenty-one million, seven hundred fifty-four thousand, three hundred eighty-nine".