21106771 has 8 divisors (see below), whose sum is σ = 24227424. Its totient is φ = 18012480.

The previous prime is 21106769. The next prime is 21106819. The reversal of 21106771 is 17760112.

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 21106771 - 2¹ = 21106769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21106721) 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, 4840 + ... + 8101.

It is an arithmetic number, because the mean of its divisors is an integer number (3028428).

Almost surely, 2^21106771 is an apocalyptic number.

21106771 is a deficient number, since it is larger than the sum of its proper divisors (3120653).

21106771 is a wasteful number, since it uses less digits than its factorization.

21106771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13181.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 21106771 is about 4594.2105959566. The cubic root of 21106771 is about 276.3592037694.

Adding to 21106771 its reverse (17760112), we get a palindrome (38866883).

The spelling of 21106771 in words is "twenty-one million, one hundred six thousand, seven hundred seventy-one".