21960871 has 8 divisors (see below), whose sum is σ = 22604400. Its totient is φ = 21322560.

The previous prime is 21960853. The next prime is 21960893. The reversal of 21960871 is 17806912.

It is a happy number.

21960871 is nontrivially palindromic in base 15.

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 21960871 - 2¹⁵ = 21928103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21960811) 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, 8220 + ... + 10558.

It is an arithmetic number, because the mean of its divisors is an integer number (2825550).

Almost surely, 2^21960871 is an apocalyptic number.

21960871 is a deficient number, since it is larger than the sum of its proper divisors (643529).

21960871 is a wasteful number, since it uses less digits than its factorization.

21960871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 21960871 is about 4686.2427380579. The cubic root of 21960871 is about 280.0377117573.

The spelling of 21960871 in words is "twenty-one million, nine hundred sixty thousand, eight hundred seventy-one".