21067330 has 8 divisors (see below), whose sum is σ = 37921212. Its totient is φ = 8426928.

The previous prime is 21067303. The next prime is 21067331. The reversal of 21067330 is 3376012.

It can be written as a sum of positive squares in 2 ways, for example, as 20277009 + 790321 = 4503^2 + 889^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21067331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053357 + ... + 1053376.

Almost surely, 2^21067330 is an apocalyptic number.

21067330 is a deficient number, since it is larger than the sum of its proper divisors (16853882).

21067330 is a wasteful number, since it uses less digits than its factorization.

21067330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106740.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 21067330 is about 4589.9161212379. The cubic root of 21067330 is about 276.1869576256.

The spelling of 21067330 in words is "twenty-one million, sixty-seven thousand, three hundred thirty".