21219484 has 24 divisors (see below), whose sum is σ = 43627248. Its totient is φ = 8903040.

The previous prime is 21219481. The next prime is 21219493. The reversal of 21219484 is 48491212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21219481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17977 + ... + 19120.

It is an arithmetic number, because the mean of its divisors is an integer number (1817802).

Almost surely, 2^21219484 is an apocalyptic number.

It is an amenable number.

21219484 is an abundant number, since it is smaller than the sum of its proper divisors (22407764).

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

21219484 is a wasteful number, since it uses less digits than its factorization.

21219484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37125 (or 37123 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 21219484 is about 4606.4611145651. The cubic root of 21219484 is about 276.8502624876.

The spelling of 21219484 in words is "twenty-one million, two hundred nineteen thousand, four hundred eighty-four".