21484040 has 32 divisors (see below), whose sum is σ = 48600000. Its totient is φ = 8547264.

The previous prime is 21484033. The next prime is 21484061. The reversal of 21484040 is 4048412.

It is a junction number, because it is equal to n+sod(n) for n = 21483997 and 21484015.

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, 6611 + ... + 9309.

It is an arithmetic number, because the mean of its divisors is an integer number (1518750).

Almost surely, 2^21484040 is an apocalyptic number.

21484040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21484040 is an abundant number, since it is smaller than the sum of its proper divisors (27115960).

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

21484040 is a wasteful number, since it uses less digits than its factorization.

21484040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909 (or 2905 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 21484040 is about 4635.0879171813. The cubic root of 21484040 is about 277.9960664005.

The spelling of 21484040 in words is "twenty-one million, four hundred eighty-four thousand, forty".