21202416 has 60 divisors (see below), whose sum is σ = 59908368. Its totient is φ = 6999552.

The previous prime is 21202409. The next prime is 21202421. The reversal of 21202416 is 61420212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15621 + ... + 16923.

Almost surely, 2^21202416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29954184).

21202416 is an abundant number, since it is smaller than the sum of its proper divisors (38705952).

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

21202416 is a wasteful number, since it uses less digits than its factorization.

21202416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430 (or 1421 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21202416 is about 4604.6081266488. The cubic root of 21202416 is about 276.7760139372.

Adding to 21202416 its reverse (61420212), we get a palindrome (82622628).

The spelling of 21202416 in words is "twenty-one million, two hundred two thousand, four hundred sixteen".