21327745 has 8 divisors (see below), whose sum is σ = 25795584. Its totient is φ = 16927344.

The previous prime is 21327727. The next prime is 21327751. The reversal of 21327745 is 54772312.

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 21327745 - 2⁷ = 21327617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16159 + ... + 17428.

It is an arithmetic number, because the mean of its divisors is an integer number (3224448).

Almost surely, 2^21327745 is an apocalyptic number.

It is an amenable number.

21327745 is a deficient number, since it is larger than the sum of its proper divisors (4467839).

21327745 is a wasteful number, since it uses less digits than its factorization.

21327745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33719.

The product of its digits is 11760, while the sum is 31.

The square root of 21327745 is about 4618.1971590654. The cubic root of 21327745 is about 277.3202905384.

The spelling of 21327745 in words is "twenty-one million, three hundred twenty-seven thousand, seven hundred forty-five".