21706468 has 24 divisors (see below), whose sum is σ = 44235072. Its totient is φ = 9126624.

The previous prime is 21706463. The next prime is 21706519. The reversal of 21706468 is 86460712.

It is not an unprimeable number, because it can be changed into a prime (21706463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5830 + ... + 8797.

It is an arithmetic number, because the mean of its divisors is an integer number (1843128).

Almost surely, 2^21706468 is an apocalyptic number.

21706468 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21706468 is an abundant number, since it is smaller than the sum of its proper divisors (22528604).

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

21706468 is a wasteful number, since it uses less digits than its factorization.

21706468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14691 (or 14689 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 21706468 is about 4659.0200686410. The cubic root of 21706468 is about 278.9521549659.

The spelling of 21706468 in words is "twenty-one million, seven hundred six thousand, four hundred sixty-eight".