21754747 has 8 divisors (see below), whose sum is σ = 26325216. Its totient is φ = 17549952.

The previous prime is 21754741. The next prime is 21754769. The reversal of 21754747 is 74745712.

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

It is not a de Polignac number, because 21754747 - 2¹¹ = 21752699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21754741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91288 + ... + 91525.

It is an arithmetic number, because the mean of its divisors is an integer number (3290652).

Almost surely, 2^21754747 is an apocalyptic number.

21754747 is a deficient number, since it is larger than the sum of its proper divisors (4570469).

21754747 is a wasteful number, since it uses less digits than its factorization.

21754747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182837.

The product of its digits is 54880, while the sum is 37.

The square root of 21754747 is about 4664.1984305988. The cubic root of 21754747 is about 279.1588146996.

The spelling of 21754747 in words is "twenty-one million, seven hundred fifty-four thousand, seven hundred forty-seven".