21466669 has 8 divisors (see below), whose sum is σ = 24624128. Its totient is φ = 18331920.

The previous prime is 21466651. The next prime is 21466673. The reversal of 21466669 is 96666412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21466669 - 2⁷ = 21466541 is a prime.

It is a super-2 number, since 2×21466669² = 921635755911122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466609) 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, 3597 + ... + 7474.

It is an arithmetic number, because the mean of its divisors is an integer number (3078016).

Almost surely, 2^21466669 is an apocalyptic number.

It is an amenable number.

21466669 is a deficient number, since it is larger than the sum of its proper divisors (3157459).

21466669 is a wasteful number, since it uses less digits than its factorization.

21466669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11355.

The product of its digits is 93312, while the sum is 40.

The square root of 21466669 is about 4633.2136795102. The cubic root of 21466669 is about 277.9211212820.

The spelling of 21466669 in words is "twenty-one million, four hundred sixty-six thousand, six hundred sixty-nine".