21704371 has 8 divisors (see below), whose sum is σ = 24128384. Its totient is φ = 19388160.

The previous prime is 21704369. The next prime is 21704377. The reversal of 21704371 is 17340712.

It is a happy number.

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 21704371 - 2¹ = 21704369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21704377) 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, 26526 + ... + 27331.

It is an arithmetic number, because the mean of its divisors is an integer number (3016048).

Almost surely, 2^21704371 is an apocalyptic number.

21704371 is a deficient number, since it is larger than the sum of its proper divisors (2424013).

21704371 is a wasteful number, since it uses less digits than its factorization.

21704371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53901.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21704371 is about 4658.7950158813. The cubic root of 21704371 is about 278.9431717524.

The spelling of 21704371 in words is "twenty-one million, seven hundred four thousand, three hundred seventy-one".