21704468 has 6 divisors (see below), whose sum is σ = 37982826. Its totient is φ = 10852232.

The previous prime is 21704467. The next prime is 21704477. The reversal of 21704468 is 86440712.

It can be written as a sum of positive squares in only one way, i.e., 12475024 + 9229444 = 3532^2 + 3038^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2713055 + ... + 2713062.

It is an arithmetic number, because the mean of its divisors is an integer number (6330471).

Almost surely, 2^21704468 is an apocalyptic number.

It is an amenable number.

21704468 is a deficient number, since it is larger than the sum of its proper divisors (16278358).

21704468 is a wasteful number, since it uses less digits than its factorization.

21704468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426121 (or 5426119 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21704468 is about 4658.8054262869. The cubic root of 21704468 is about 278.9435872977.

The spelling of 21704468 in words is "twenty-one million, seven hundred four thousand, four hundred sixty-eight".