21626124 has 24 divisors (see below), whose sum is σ = 54342960. Its totient is φ = 6654144.

The previous prime is 21626051. The next prime is 21626131. The reversal of 21626124 is 42162612.

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 = 21626094 and 21626103.

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, 69159 + ... + 69470.

It is an arithmetic number, because the mean of its divisors is an integer number (2264290).

Almost surely, 2^21626124 is an apocalyptic number.

It is an amenable number.

21626124 is an abundant number, since it is smaller than the sum of its proper divisors (32716836).

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

21626124 is a wasteful number, since it uses less digits than its factorization.

21626124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138649 (or 138647 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21626124 is about 4650.3896610929. The cubic root of 21626124 is about 278.6075596603.

Adding to 21626124 its reverse (42162612), we get a palindrome (63788736).

The spelling of 21626124 in words is "twenty-one million, six hundred twenty-six thousand, one hundred twenty-four".