21070683 has 12 divisors (see below), whose sum is σ = 30510480. Its totient is φ = 14012496.

The previous prime is 21070657. The next prime is 21070703. The reversal of 21070683 is 38607012.

It is not a de Polignac number, because 21070683 - 2¹⁸ = 20808539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21070603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1285 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (2542540).

Almost surely, 2^21070683 is an apocalyptic number.

21070683 is a deficient number, since it is larger than the sum of its proper divisors (9439797).

21070683 is a wasteful number, since it uses less digits than its factorization.

21070683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5778 (or 5775 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21070683 is about 4590.2813639253. The cubic root of 21070683 is about 276.2016091538.

Adding to 21070683 its reverse (38607012), we get a palindrome (59677695).

The spelling of 21070683 in words is "twenty-one million, seventy thousand, six hundred eighty-three".