21828146 has 4 divisors (see below), whose sum is σ = 32742222. Its totient is φ = 10914072.

The previous prime is 21828101. The next prime is 21828151. The reversal of 21828146 is 64182812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 1677025 = 4489^2 + 1295^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5457035 + ... + 5457038.

Almost surely, 2^21828146 is an apocalyptic number.

21828146 is a deficient number, since it is larger than the sum of its proper divisors (10914076).

21828146 is a wasteful number, since it uses less digits than its factorization.

21828146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10914075.

The product of its digits is 6144, while the sum is 32.

The square root of 21828146 is about 4672.0601451608. The cubic root of 21828146 is about 279.4724164010.

The spelling of 21828146 in words is "twenty-one million, eight hundred twenty-eight thousand, one hundred forty-six".