21067057 has 8 divisors (see below), whose sum is σ = 23981760. Its totient is φ = 18318960.

The previous prime is 21067043. The next prime is 21067087. The reversal of 21067057 is 75076012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21067057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21067037) 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 7 ways as a sum of consecutive naturals, for example, 41382 + ... + 41887.

It is an arithmetic number, because the mean of its divisors is an integer number (2997720).

Almost surely, 2^21067057 is an apocalyptic number.

It is an amenable number.

21067057 is a deficient number, since it is larger than the sum of its proper divisors (2914703).

21067057 is a wasteful number, since it uses less digits than its factorization.

21067057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83303.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 21067057 is about 4589.8863820361. The cubic root of 21067057 is about 276.1857646352.

The spelling of 21067057 in words is "twenty-one million, sixty-seven thousand, fifty-seven".