21140416 has 28 divisors (see below), whose sum is σ = 45765720. Its totient is φ = 9608960.

The previous prime is 21140389. The next prime is 21140423. The reversal of 21140416 is 61404112.

It is a junction number, because it is equal to n+sod(n) for n = 21140393 and 21140402.

It is a congruent number.

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, 14311 + ... + 15718.

It is an arithmetic number, because the mean of its divisors is an integer number (1634490).

Almost surely, 2^21140416 is an apocalyptic number.

It is an amenable number.

21140416 is an abundant number, since it is smaller than the sum of its proper divisors (24625304).

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

21140416 is a wasteful number, since it uses less digits than its factorization.

21140416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30052 (or 30042 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21140416 is about 4597.8708115822. The cubic root of 21140416 is about 276.5059681935.

Adding to 21140416 its reverse (61404112), we get a palindrome (82544528).

The spelling of 21140416 in words is "twenty-one million, one hundred forty thousand, four hundred sixteen".