21228162 has 8 divisors (see below), whose sum is σ = 42456336. Its totient is φ = 7076052.

The previous prime is 21228139. The next prime is 21228167. The reversal of 21228162 is 26182212.

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

21228162 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21228167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1769008 + ... + 1769019.

It is an arithmetic number, because the mean of its divisors is an integer number (5307042).

Almost surely, 2^21228162 is an apocalyptic number.

21228162 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21228162 is a wasteful number, since it uses less digits than its factorization.

21228162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538032.

The product of its digits is 768, while the sum is 24.

The square root of 21228162 is about 4607.4029561131. The cubic root of 21228162 is about 276.8879979189.

The spelling of 21228162 in words is "twenty-one million, two hundred twenty-eight thousand, one hundred sixty-two".