21049338 has 16 divisors (see below), whose sum is σ = 42153696. Its totient is φ = 7007280.

The previous prime is 21049333. The next prime is 21049363. The reversal of 21049338 is 83394012.

It is not an unprimeable number, because it can be changed into a prime (21049333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4020 + ... + 7632.

It is an arithmetic number, because the mean of its divisors is an integer number (2634606).

Almost surely, 2^21049338 is an apocalyptic number.

21049338 is an abundant number, since it is smaller than the sum of its proper divisors (21104358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21049338 is a wasteful number, since it uses less digits than its factorization.

21049338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4589.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21049338 is about 4587.9557539279. The cubic root of 21049338 is about 276.1083118265.

The spelling of 21049338 in words is "twenty-one million, forty-nine thousand, three hundred thirty-eight".