21038242 has 8 divisors (see below), whose sum is σ = 31583232. Its totient is φ = 10510500.

The previous prime is 21038219. The next prime is 21038249. The reversal of 21038242 is 24283012.

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 (21038249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634 + ... + 6517.

It is an arithmetic number, because the mean of its divisors is an integer number (3947904).

Almost surely, 2^21038242 is an apocalyptic number.

21038242 is a deficient number, since it is larger than the sum of its proper divisors (10544990).

21038242 is a wasteful number, since it uses less digits than its factorization.

21038242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8624.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21038242 is about 4586.7463413623. The cubic root of 21038242 is about 276.0597871600.

The spelling of 21038242 in words is "twenty-one million, thirty-eight thousand, two hundred forty-two".