21417468 has 12 divisors (see below), whose sum is σ = 49974120. Its totient is φ = 7139152.

The previous prime is 21417463. The next prime is 21417481. The reversal of 21417468 is 86471412.

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 (21417463) 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, 892383 + ... + 892406.

It is an arithmetic number, because the mean of its divisors is an integer number (4164510).

Almost surely, 2^21417468 is an apocalyptic number.

It is an amenable number.

21417468 is an abundant number, since it is smaller than the sum of its proper divisors (28556652).

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

21417468 is a wasteful number, since it uses less digits than its factorization.

21417468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784796 (or 1784794 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 21417468 is about 4627.9010361070. The cubic root of 21417468 is about 277.7086297334.

The spelling of 21417468 in words is "twenty-one million, four hundred seventeen thousand, four hundred sixty-eight".