21416484 has 12 divisors (see below), whose sum is σ = 49971824. Its totient is φ = 7138824.

The previous prime is 21416459. The next prime is 21416491. The reversal of 21416484 is 48461412.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892342 + ... + 892365.

Almost surely, 2^21416484 is an apocalyptic number.

It is an amenable number.

21416484 is an abundant number, since it is smaller than the sum of its proper divisors (28555340).

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

21416484 is a wasteful number, since it uses less digits than its factorization.

21416484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784714 (or 1784712 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 21416484 is about 4627.7947231916. The cubic root of 21416484 is about 277.7043766711.

Adding to 21416484 its reverse (48461412), we get a palindrome (69877896).

The spelling of 21416484 in words is "twenty-one million, four hundred sixteen thousand, four hundred eighty-four".