21124611 has 8 divisors (see below), whose sum is σ = 31295760. Its totient is φ = 14083056.

The previous prime is 21124601. The next prime is 21124619. The reversal of 21124611 is 11642112.

It is not a de Polignac number, because 21124611 - 2⁹ = 21124099 is a prime.

It is a super-3 number, since 3×21124611³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21124619) 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, 391170 + ... + 391223.

It is an arithmetic number, because the mean of its divisors is an integer number (3911970).

Almost surely, 2^21124611 is an apocalyptic number.

21124611 is a deficient number, since it is larger than the sum of its proper divisors (10171149).

21124611 is an equidigital number, since it uses as much as digits as its factorization.

21124611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782402 (or 782396 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 21124611 is about 4596.1517598965. The cubic root of 21124611 is about 276.4370438740.

Adding to 21124611 its reverse (11642112), we get a palindrome (32766723).

The spelling of 21124611 in words is "twenty-one million, one hundred twenty-four thousand, six hundred eleven".