21422116 has 12 divisors (see below), whose sum is σ = 38698240. Its totient is φ = 10365480.

The previous prime is 21422099. The next prime is 21422117. The reversal of 21422116 is 61122412.

It is a junction number, because it is equal to n+sod(n) for n = 21422093 and 21422102.

It is not an unprimeable number, because it can be changed into a prime (21422117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86256 + ... + 86503.

Almost surely, 2^21422116 is an apocalyptic number.

It is an amenable number.

21422116 is a deficient number, since it is larger than the sum of its proper divisors (17276124).

21422116 is a wasteful number, since it uses less digits than its factorization.

21422116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172794 (or 172792 counting only the distinct ones).

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

The square root of 21422116 is about 4628.4031803636. The cubic root of 21422116 is about 277.7287176409.

Adding to 21422116 its reverse (61122412), we get a palindrome (82544528).

The spelling of 21422116 in words is "twenty-one million, four hundred twenty-two thousand, one hundred sixteen".