21484180 has 24 divisors (see below), whose sum is σ = 45255168. Its totient is φ = 8567328.

The previous prime is 21484163. The next prime is 21484187. The reversal of 21484180 is 8148412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484187) 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, 5877 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (1885632).

Almost surely, 2^21484180 is an apocalyptic number.

21484180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21484180 is an abundant number, since it is smaller than the sum of its proper divisors (23770988).

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

21484180 is a wasteful number, since it uses less digits than its factorization.

21484180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303 (or 3301 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21484180 is about 4635.1030193513. The cubic root of 21484180 is about 277.9966702498.

It can be divided in two parts, 2148 and 4180, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 21484180 in words is "twenty-one million, four hundred eighty-four thousand, one hundred eighty".