21470116 has 24 divisors (see below), whose sum is σ = 40352256. Its totient is φ = 9959040.

The previous prime is 21470081. The next prime is 21470123. The reversal of 21470116 is 61107412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2605 + ... + 7051.

It is an arithmetic number, because the mean of its divisors is an integer number (1681344).

Almost surely, 2^21470116 is an apocalyptic number.

It is an amenable number.

21470116 is a deficient number, since it is larger than the sum of its proper divisors (18882140).

21470116 is a wasteful number, since it uses less digits than its factorization.

21470116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539 (or 4537 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21470116 is about 4633.5856526021. The cubic root of 21470116 is about 277.9359961691.

Adding to 21470116 its reverse (61107412), we get a palindrome (82577528).

The spelling of 21470116 in words is "twenty-one million, four hundred seventy thousand, one hundred sixteen".