21241838 has 8 divisors (see below), whose sum is σ = 32540832. Its totient is φ = 10394896.

The previous prime is 21241837. The next prime is 21241849. The reversal of 21241838 is 83814212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21241838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241837) 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, 112895 + ... + 113082.

It is an arithmetic number, because the mean of its divisors is an integer number (4067604).

Almost surely, 2^21241838 is an apocalyptic number.

21241838 is a deficient number, since it is larger than the sum of its proper divisors (11298994).

21241838 is a wasteful number, since it uses less digits than its factorization.

21241838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226026.

The product of its digits is 3072, while the sum is 29.

The square root of 21241838 is about 4608.8868504228. The cubic root of 21241838 is about 276.9474457939.

The spelling of 21241838 in words is "twenty-one million, two hundred forty-one thousand, eight hundred thirty-eight".