21474828 has 24 divisors (see below), whose sum is σ = 55675760. Its totient is φ = 7158240.

The previous prime is 21474821. The next prime is 21474829. The reversal of 21474828 is 82847412.

It is a super-2 number, since 2×21474828² = 922336475259168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21474792 and 21474801.

It is not an unprimeable number, because it can be changed into a prime (21474821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99313 + ... + 99528.

Almost surely, 2^21474828 is an apocalyptic number.

It is an amenable number.

21474828 is an abundant number, since it is smaller than the sum of its proper divisors (34200932).

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

21474828 is a wasteful number, since it uses less digits than its factorization.

21474828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198854 (or 198846 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 21474828 is about 4634.0940862266. The cubic root of 21474828 is about 277.9563273528.

The spelling of 21474828 in words is "twenty-one million, four hundred seventy-four thousand, eight hundred twenty-eight".