21793707 has 12 divisors (see below), whose sum is σ = 33901504. Its totient is φ = 13411440.

The previous prime is 21793699. The next prime is 21793721. The reversal of 21793707 is 70739712.

It is not a de Polignac number, because 21793707 - 2³ = 21793699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21793747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93019 + ... + 93252.

Almost surely, 2^21793707 is an apocalyptic number.

21793707 is a deficient number, since it is larger than the sum of its proper divisors (12107797).

21793707 is a wasteful number, since it uses less digits than its factorization.

21793707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186290 (or 186287 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 21793707 is about 4668.3730570725. The cubic root of 21793707 is about 279.3253613594.

It can be divided in two parts, 21793 and 707, that added together give a square (22500 = 150²).

The spelling of 21793707 in words is "twenty-one million, seven hundred ninety-three thousand, seven hundred seven".