21160073 has 8 divisors (see below), whose sum is σ = 23828736. Its totient is φ = 18615600.

The previous prime is 21160043. The next prime is 21160079. The reversal of 21160073 is 37006112.

It is a happy number.

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 21160073 - 2¹² = 21155977 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 30686 + ... + 31367.

It is an arithmetic number, because the mean of its divisors is an integer number (2978592).

Almost surely, 2^21160073 is an apocalyptic number.

It is an amenable number.

21160073 is a deficient number, since it is larger than the sum of its proper divisors (2668663).

21160073 is a wasteful number, since it uses less digits than its factorization.

21160073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62095.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21160073 is about 4600.0079347758. The cubic root of 21160073 is about 276.5916428566.

Adding to 21160073 its reverse (37006112), we get a palindrome (58166185).

The spelling of 21160073 in words is "twenty-one million, one hundred sixty thousand, seventy-three".