21341828 has 12 divisors (see below), whose sum is σ = 38053260. Its totient is φ = 10469472.

The previous prime is 21341821. The next prime is 21341833. The reversal of 21341828 is 82814312.

It can be written as a sum of positive squares in 2 ways, for example, as 18130564 + 3211264 = 4258^2 + 1792^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21341828.

It is not an unprimeable number, because it can be changed into a prime (21341821) 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, 50123 + ... + 50546.

It is an arithmetic number, because the mean of its divisors is an integer number (3171105).

Almost surely, 2^21341828 is an apocalyptic number.

It is an amenable number.

21341828 is a deficient number, since it is larger than the sum of its proper divisors (16711432).

21341828 is a wasteful number, since it uses less digits than its factorization.

21341828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100726 (or 100724 counting only the distinct ones).

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

The square root of 21341828 is about 4619.7216366357. The cubic root of 21341828 is about 277.3813165610.

The spelling of 21341828 in words is "twenty-one million, three hundred forty-one thousand, eight hundred twenty-eight".