21827371 has 8 divisors (see below), whose sum is σ = 24328080. Its totient is φ = 19461888.

The previous prime is 21827369. The next prime is 21827381. The reversal of 21827371 is 17372812.

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 21827371 - 2¹ = 21827369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21827381) 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, 33466 + ... + 34111.

It is an arithmetic number, because the mean of its divisors is an integer number (3041010).

Almost surely, 2^21827371 is an apocalyptic number.

21827371 is a deficient number, since it is larger than the sum of its proper divisors (2500709).

21827371 is a wasteful number, since it uses less digits than its factorization.

21827371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67613.

The product of its digits is 4704, while the sum is 31.

The square root of 21827371 is about 4671.9772045677. The cubic root of 21827371 is about 279.4691088413.

The spelling of 21827371 in words is "twenty-one million, eight hundred twenty-seven thousand, three hundred seventy-one".