21707373 has 8 divisors (see below), whose sum is σ = 29559168. Its totient is φ = 14163584.

The previous prime is 21707359. The next prime is 21707393. The reversal of 21707373 is 37370712.

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 21707373 - 2⁸ = 21707117 is a prime.

It is a super-2 number, since 2×21707373² = 942420085122258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21707373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707393) 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, 76836 + ... + 77117.

It is an arithmetic number, because the mean of its divisors is an integer number (3694896).

Almost surely, 2^21707373 is an apocalyptic number.

It is an amenable number.

21707373 is a deficient number, since it is larger than the sum of its proper divisors (7851795).

21707373 is a wasteful number, since it uses less digits than its factorization.

21707373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154003.

The product of its (nonzero) digits is 6174, while the sum is 30.

The square root of 21707373 is about 4659.1171910567. The cubic root of 21707373 is about 278.9560316628.

The spelling of 21707373 in words is "twenty-one million, seven hundred seven thousand, three hundred seventy-three".