21704472 has 48 divisors (see below), whose sum is σ = 59066280. Its totient is φ = 7200000.

The previous prime is 21704467. The next prime is 21704477. The reversal of 21704472 is 27440712.

It is a happy number.

21704472 is a `hidden beast` number, since 217 + 0 + 447 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21704467) and next prime (21704477).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17472 + ... + 18672.

Almost surely, 2^21704472 is an apocalyptic number.

It is an amenable number.

21704472 is an abundant number, since it is smaller than the sum of its proper divisors (37361808).

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

21704472 is a wasteful number, since it uses less digits than its factorization.

21704472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464 (or 1457 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 21704472 is about 4658.8058555814. The cubic root of 21704472 is about 278.9436044335.

The spelling of 21704472 in words is "twenty-one million, seven hundred four thousand, four hundred seventy-two".