21228152 has 16 divisors (see below), whose sum is σ = 43421400. Its totient is φ = 9649120.

The previous prime is 21228139. The next prime is 21228167. The reversal of 21228152 is 25182212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120527 + ... + 120702.

Almost surely, 2^21228152 is an apocalyptic number.

21228152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21228152 is an abundant number, since it is smaller than the sum of its proper divisors (22193248).

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

21228152 is a wasteful number, since it uses less digits than its factorization.

21228152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241246 (or 241242 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 21228152 is about 4607.4018709029. The cubic root of 21228152 is about 276.8879544408.

The spelling of 21228152 in words is "twenty-one million, two hundred twenty-eight thousand, one hundred fifty-two".