21088771 has 8 divisors (see below), whose sum is σ = 23799600. Its totient is φ = 18510240.

The previous prime is 21088763. The next prime is 21088787. The reversal of 21088771 is 17788012.

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 21088771 - 2³ = 21088763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21088741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32736 + ... + 33373.

It is an arithmetic number, because the mean of its divisors is an integer number (2974950).

Almost surely, 2^21088771 is an apocalyptic number.

21088771 is a deficient number, since it is larger than the sum of its proper divisors (2710829).

21088771 is a wasteful number, since it uses less digits than its factorization.

21088771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66149.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 21088771 is about 4592.2511908649. The cubic root of 21088771 is about 276.2806210810.

The spelling of 21088771 in words is "twenty-one million, eighty-eight thousand, seven hundred seventy-one".