21245116 has 12 divisors (see below), whose sum is σ = 39135880. Its totient is φ = 10063440.

The previous prime is 21245111. The next prime is 21245129. The reversal of 21245116 is 61154212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245111) 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 3 ways as a sum of consecutive naturals, for example, 139695 + ... + 139846.

Almost surely, 2^21245116 is an apocalyptic number.

It is an amenable number.

21245116 is a deficient number, since it is larger than the sum of its proper divisors (17890764).

21245116 is a wasteful number, since it uses less digits than its factorization.

21245116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279564 (or 279562 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 21245116 is about 4609.2424540265. The cubic root of 21245116 is about 276.9616910621.

Adding to 21245116 its reverse (61154212), we get a palindrome (82399328).

The spelling of 21245116 in words is "twenty-one million, two hundred forty-five thousand, one hundred sixteen".