21050329 has 4 divisors (see below), whose sum is σ = 21081060. Its totient is φ = 21019600.

The previous prime is 21050311. The next prime is 21050339. The reversal of 21050329 is 92305012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19784704 + 1265625 = 4448^2 + 1125^2 .

It is a cyclic number.

It is not a de Polignac number, because 21050329 - 2⁵ = 21050297 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21050339) 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, 14314 + ... + 15715.

It is an arithmetic number, because the mean of its divisors is an integer number (5270265).

Almost surely, 2^21050329 is an apocalyptic number.

It is an amenable number.

21050329 is a deficient number, since it is larger than the sum of its proper divisors (30731).

21050329 is an equidigital number, since it uses as much as digits as its factorization.

21050329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30730.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 21050329 is about 4588.0637528265. The cubic root of 21050329 is about 276.1126448059.

The spelling of 21050329 in words is "twenty-one million, fifty thousand, three hundred twenty-nine".