21707294 has 24 divisors (see below), whose sum is σ = 38044080. Its totient is φ = 9262176.

The previous prime is 21707293. The next prime is 21707297. The reversal of 21707294 is 49270712.

It is a super-2 number, since 2×21707294² = 942413225604872, 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 21707294.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707293) 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, 34874 + ... + 35490.

It is an arithmetic number, because the mean of its divisors is an integer number (1585170).

Almost surely, 2^21707294 is an apocalyptic number.

21707294 is a deficient number, since it is larger than the sum of its proper divisors (16336786).

21707294 is a wasteful number, since it uses less digits than its factorization.

21707294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 21707294 is about 4659.1087130480. The cubic root of 21707294 is about 278.9556932593.

The spelling of 21707294 in words is "twenty-one million, seven hundred seven thousand, two hundred ninety-four".