21467718 has 12 divisors (see below), whose sum is σ = 46513428. Its totient is φ = 7155900.

The previous prime is 21467713. The next prime is 21467729. The reversal of 21467718 is 81776412.

It is a super-2 number, since 2×21467718² = 921725832255048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21467711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596308 + ... + 596343.

It is an arithmetic number, because the mean of its divisors is an integer number (3876119).

Almost surely, 2^21467718 is an apocalyptic number.

21467718 is an abundant number, since it is smaller than the sum of its proper divisors (25045710).

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

21467718 is a wasteful number, since it uses less digits than its factorization.

21467718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192659 (or 1192656 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 21467718 is about 4633.3268824895. The cubic root of 21467718 is about 277.9256482148.

The spelling of 21467718 in words is "twenty-one million, four hundred sixty-seven thousand, seven hundred eighteen".