21124411 has 16 divisors (see below), whose sum is σ = 26466048. Its totient is φ = 16380000.

The previous prime is 21124391. The next prime is 21124459. The reversal of 21124411 is 11442112.

It is a happy number.

It is not a de Polignac number, because 21124411 - 2⁹ = 21123899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18781 + ... + 19873.

It is an arithmetic number, because the mean of its divisors is an integer number (1654128).

Almost surely, 2^21124411 is an apocalyptic number.

21124411 is a deficient number, since it is larger than the sum of its proper divisors (5341637).

21124411 is a wasteful number, since it uses less digits than its factorization.

21124411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362.

The product of its digits is 64, while the sum is 16.

The square root of 21124411 is about 4596.1300025130. The cubic root of 21124411 is about 276.4361714700.

Adding to 21124411 its reverse (11442112), we get a palindrome (32566523).

The spelling of 21124411 in words is "twenty-one million, one hundred twenty-four thousand, four hundred eleven".