21124626 has 16 divisors (see below), whose sum is σ = 44086464. Its totient is φ = 6735344.

The previous prime is 21124619. The next prime is 21124627. The reversal of 21124626 is 62642112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21124596 and 21124605.

It is not an unprimeable number, because it can be changed into a prime (21124627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76401 + ... + 76676.

It is an arithmetic number, because the mean of its divisors is an integer number (2755404).

Almost surely, 2^21124626 is an apocalyptic number.

21124626 is an abundant number, since it is smaller than the sum of its proper divisors (22961838).

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

21124626 is a wasteful number, since it uses less digits than its factorization.

21124626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153105.

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

The square root of 21124626 is about 4596.1533916961. The cubic root of 21124626 is about 276.4371093041.

Adding to 21124626 its reverse (62642112), we get a palindrome (83766738).

The spelling of 21124626 in words is "twenty-one million, one hundred twenty-four thousand, six hundred twenty-six".