21071763 has 12 divisors (see below), whose sum is σ = 31145400. Its totient is φ = 13720896.

The previous prime is 21071761. The next prime is 21071767. The reversal of 21071763 is 36717012.

It is not a de Polignac number, because 21071763 - 2¹ = 21071761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21071761) 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, 26838 + ... + 27611.

It is an arithmetic number, because the mean of its divisors is an integer number (2595450).

Almost surely, 2^21071763 is an apocalyptic number.

21071763 is a deficient number, since it is larger than the sum of its proper divisors (10073637).

21071763 is a wasteful number, since it uses less digits than its factorization.

21071763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54498 (or 54495 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 21071763 is about 4590.3990022655. The cubic root of 21071763 is about 276.2063280745.

Adding to 21071763 its reverse (36717012), we get a palindrome (57788775).

The spelling of 21071763 in words is "twenty-one million, seventy-one thousand, seven hundred sixty-three".