21114828 has 72 divisors (see below), whose sum is σ = 63667968. Its totient is φ = 5768928.

The previous prime is 21114817. The next prime is 21114839. The reversal of 21114828 is 82841112.

It is an interprime number because it is at equal distance from previous prime (21114817) and next prime (21114839).

It is a super-2 number, since 2×21114828² = 891671922939168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3975 + ... + 7617.

Almost surely, 2^21114828 is an apocalyptic number.

21114828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21114828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31833984).

21114828 is an abundant number, since it is smaller than the sum of its proper divisors (42553140).

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

21114828 is a wasteful number, since it uses less digits than its factorization.

21114828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683 (or 3678 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 21114828 is about 4595.0873767536. The cubic root of 21114828 is about 276.3943637795.

The spelling of 21114828 in words is "twenty-one million, one hundred fourteen thousand, eight hundred twenty-eight".