21124410 has 32 divisors (see below), whose sum is σ = 52071552. Its totient is φ = 5480640.

The previous prime is 21124391. The next prime is 21124459. The reversal of 21124410 is 1442112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21124410.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8406 + ... + 10625.

It is an arithmetic number, because the mean of its divisors is an integer number (1627236).

Almost surely, 2^21124410 is an apocalyptic number.

21124410 is an abundant number, since it is smaller than the sum of its proper divisors (30947142).

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

21124410 is a wasteful number, since it uses less digits than its factorization.

21124410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19078.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21124410 is about 4596.1298937258. The cubic root of 21124410 is about 276.4361671080.

Adding to 21124410 its reverse (1442112), we get a palindrome (22566522).

The spelling of 21124410 in words is "twenty-one million, one hundred twenty-four thousand, four hundred ten".