21160071 has 12 divisors (see below), whose sum is σ = 30952480. Its totient is φ = 13927680.

The previous prime is 21160043. The next prime is 21160079. The reversal of 21160071 is 17006112.

It is not a de Polignac number, because 21160071 - 2¹⁵ = 21127303 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 (21160079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14170 + ... + 15591.

Almost surely, 2^21160071 is an apocalyptic number.

21160071 is a deficient number, since it is larger than the sum of its proper divisors (9792409).

21160071 is a wasteful number, since it uses less digits than its factorization.

21160071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29846 (or 29843 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 21160071 is about 4600.0077173848. The cubic root of 21160071 is about 276.5916341423.

Adding to 21160071 its reverse (17006112), we get a palindrome (38166183).

The spelling of 21160071 in words is "twenty-one million, one hundred sixty thousand, seventy-one".