21484421 has 16 divisors (see below), whose sum is σ = 26242560. Its totient is φ = 17178480.

The previous prime is 21484409. The next prime is 21484453. The reversal of 21484421 is 12448412.

It is a cyclic number.

It is not a de Polignac number, because 21484421 - 2⁶ = 21484357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7706 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (1640160).

Almost surely, 2^21484421 is an apocalyptic number.

It is an amenable number.

21484421 is a deficient number, since it is larger than the sum of its proper divisors (4758139).

21484421 is a wasteful number, since it uses less digits than its factorization.

21484421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504.

The product of its digits is 2048, while the sum is 26.

The square root of 21484421 is about 4635.1290165431. The cubic root of 21484421 is about 277.9977097270.

The spelling of 21484421 in words is "twenty-one million, four hundred eighty-four thousand, four hundred twenty-one".