21124386 has 24 divisors (see below), whose sum is σ = 46104240. Its totient is φ = 6989976.

The previous prime is 21124357. The next prime is 21124391. The reversal of 21124386 is 68342112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1720 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (1921010).

Almost surely, 2^21124386 is an apocalyptic number.

21124386 is an abundant number, since it is smaller than the sum of its proper divisors (24979854).

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

21124386 is a wasteful number, since it uses less digits than its factorization.

21124386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8590 (or 8587 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21124386 is about 4596.1272828328. The cubic root of 21124386 is about 276.4360624192.

Adding to 21124386 its reverse (68342112), we get a palindrome (89466498).

The spelling of 21124386 in words is "twenty-one million, one hundred twenty-four thousand, three hundred eighty-six".