21210484 has 24 divisors (see below), whose sum is σ = 38878560. Its totient is φ = 10111584.

The previous prime is 21210463. The next prime is 21210487. The reversal of 21210484 is 48401212.

21210484 = T₅ + T₆ + ... + T₅₀₂.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8527 + ... + 10729.

It is an arithmetic number, because the mean of its divisors is an integer number (1619940).

Almost surely, 2^21210484 is an apocalyptic number.

It is an amenable number.

21210484 is a deficient number, since it is larger than the sum of its proper divisors (17668076).

21210484 is a wasteful number, since it uses less digits than its factorization.

21210484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2317 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 21210484 is about 4605.4841222178. The cubic root of 21210484 is about 276.8111160014.

Adding to 21210484 its reverse (48401212), we get a palindrome (69611696).

The spelling of 21210484 in words is "twenty-one million, two hundred ten thousand, four hundred eighty-four".