21484420 has 24 divisors (see below), whose sum is σ = 46338264. Its totient is φ = 8361216.

The previous prime is 21484409. The next prime is 21484453. The reversal of 21484420 is 2448412.

It can be written as a sum of positive squares in 4 ways, for example, as 4460544 + 17023876 = 2112^2 + 4126^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13777 + ... + 15256.

It is an arithmetic number, because the mean of its divisors is an integer number (1930761).

Almost surely, 2^21484420 is an apocalyptic number.

21484420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21484420 is an abundant number, since it is smaller than the sum of its proper divisors (24853844).

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

21484420 is a wasteful number, since it uses less digits than its factorization.

21484420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29079 (or 29077 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 21484420 is about 4635.1289086713. The cubic root of 21484420 is about 277.9977054138.

It can be divided in two parts, 21484 and 420, that added together give a square (21904 = 148²).

The spelling of 21484420 in words is "twenty-one million, four hundred eighty-four thousand, four hundred twenty".