21622116 has 24 divisors (see below), whose sum is σ = 52645824. Its totient is φ = 6893920.

The previous prime is 21622099. The next prime is 21622123. The reversal of 21622116 is 61122612.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21622092 and 21622101.

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, 38895 + ... + 39446.

It is an arithmetic number, because the mean of its divisors is an integer number (2193576).

Almost surely, 2^21622116 is an apocalyptic number.

It is an amenable number.

21622116 is an abundant number, since it is smaller than the sum of its proper divisors (31023708).

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

21622116 is a wasteful number, since it uses less digits than its factorization.

21622116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78371 (or 78369 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 21622116 is about 4649.9587094941. The cubic root of 21622116 is about 278.5903470199.

Adding to 21622116 its reverse (61122612), we get a palindrome (82744728).

It can be divided in two parts, 2162 and 2116, that added together give a triangular number (4278 = T₉₂).

The spelling of 21622116 in words is "twenty-one million, six hundred twenty-two thousand, one hundred sixteen".