21707074 has 16 divisors (see below), whose sum is σ = 33132960. Its totient is φ = 10664640.

The previous prime is 21707071. The next prime is 21707083. The reversal of 21707074 is 47070712.

It is not an unprimeable number, because it can be changed into a prime (21707071) 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 7 ways as a sum of consecutive naturals, for example, 31069 + ... + 31759.

It is an arithmetic number, because the mean of its divisors is an integer number (2070810).

Almost surely, 2^21707074 is an apocalyptic number.

21707074 is a deficient number, since it is larger than the sum of its proper divisors (11425886).

21707074 is a wasteful number, since it uses less digits than its factorization.

21707074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 21707074 is about 4659.0851033223. The cubic root of 21707074 is about 278.9547508654.

Adding to 21707074 its reverse (47070712), we get a palindrome (68777786).

The spelling of 21707074 in words is "twenty-one million, seven hundred seven thousand, seventy-four".