21707412 has 12 divisors (see below), whose sum is σ = 50650656. Its totient is φ = 7235800.

The previous prime is 21707407. The next prime is 21707417. The reversal of 21707412 is 21470712.

It is an interprime number because it is at equal distance from previous prime (21707407) and next prime (21707417).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904464 + ... + 904487.

It is an arithmetic number, because the mean of its divisors is an integer number (4220888).

Almost surely, 2^21707412 is an apocalyptic number.

It is an amenable number.

21707412 is an abundant number, since it is smaller than the sum of its proper divisors (28943244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21707412 is a wasteful number, since it uses less digits than its factorization.

21707412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808958 (or 1808956 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 21707412 is about 4659.1213763971. The cubic root of 21707412 is about 278.9561987224.

The spelling of 21707412 in words is "twenty-one million, seven hundred seven thousand, four hundred twelve".