21160706 has 16 divisors (see below), whose sum is σ = 36345024. Its totient is φ = 9051504.

The previous prime is 21160679. The next prime is 21160709. The reversal of 21160706 is 60706112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21160709) 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, 8456 + ... + 10668.

It is an arithmetic number, because the mean of its divisors is an integer number (2271564).

Almost surely, 2^21160706 is an apocalyptic number.

21160706 is a deficient number, since it is larger than the sum of its proper divisors (15184318).

21160706 is a wasteful number, since it uses less digits than its factorization.

21160706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21160706 is about 4600.0767384903. The cubic root of 21160706 is about 276.5944008931.

Adding to 21160706 its reverse (60706112), we get a palindrome (81866818).

The spelling of 21160706 in words is "twenty-one million, one hundred sixty thousand, seven hundred six".