21466057 has 8 divisors (see below), whose sum is σ = 21719880. Its totient is φ = 21214080.

The previous prime is 21466037. The next prime is 21466079. The reversal of 21466057 is 75066412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 84681 + 21381376 = 291^2 + 4624^2 .

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 21466057 - 2¹⁵ = 21433289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21466037) 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, 41919 + ... + 42427.

It is an arithmetic number, because the mean of its divisors is an integer number (2714985).

Almost surely, 2^21466057 is an apocalyptic number.

It is an amenable number.

21466057 is a deficient number, since it is larger than the sum of its proper divisors (253823).

21466057 is a wasteful number, since it uses less digits than its factorization.

21466057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 21466057 is about 4633.1476341684. The cubic root of 21466057 is about 277.9184801434.

The spelling of 21466057 in words is "twenty-one million, four hundred sixty-six thousand, fifty-seven".