21004338 has 16 divisors (see below), whose sum is σ = 42194880. Its totient is φ = 6970416.

The previous prime is 21004331. The next prime is 21004351. The reversal of 21004338 is 83340012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21004331) 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, 6270 + ... + 9017.

It is an arithmetic number, because the mean of its divisors is an integer number (2637180).

Almost surely, 2^21004338 is an apocalyptic number.

21004338 is an abundant number, since it is smaller than the sum of its proper divisors (21190542).

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

21004338 is a wasteful number, since it uses less digits than its factorization.

21004338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15521.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21004338 is about 4583.0489851190. The cubic root of 21004338 is about 275.9114134938.

The spelling of 21004338 in words is "twenty-one million, four thousand, three hundred thirty-eight".