21202438 has 8 divisors (see below), whose sum is σ = 32403888. Its totient is φ = 10401144.

The previous prime is 21202429. The next prime is 21202459. The reversal of 21202438 is 83420212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99906 + ... + 100117.

It is an arithmetic number, because the mean of its divisors is an integer number (4050486).

Almost surely, 2^21202438 is an apocalyptic number.

21202438 is a deficient number, since it is larger than the sum of its proper divisors (11201450).

21202438 is a wasteful number, since it uses less digits than its factorization.

21202438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200078.

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

The square root of 21202438 is about 4604.6105155594. The cubic root of 21202438 is about 276.7761096664.

The spelling of 21202438 in words is "twenty-one million, two hundred two thousand, four hundred thirty-eight".