21484305 has 32 divisors (see below), whose sum is σ = 39093120. Its totient is φ = 11188800.

The previous prime is 21484303. The next prime is 21484321. The reversal of 21484305 is 50348412.

It is not a de Polignac number, because 21484305 - 2¹ = 21484303 is a prime.

It is a super-2 number, since 2×21484305² = 923150722666050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21484303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3955 + ... + 7655.

It is an arithmetic number, because the mean of its divisors is an integer number (1221660).

Almost surely, 2^21484305 is an apocalyptic number.

It is an amenable number.

21484305 is a deficient number, since it is larger than the sum of its proper divisors (17608815).

21484305 is a wasteful number, since it uses less digits than its factorization.

21484305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758 (or 3752 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21484305 is about 4635.1165033902. The cubic root of 21484305 is about 277.9972093987.

The spelling of 21484305 in words is "twenty-one million, four hundred eighty-four thousand, three hundred five".