21124113 has 16 divisors (see below), whose sum is σ = 29246976. Its totient is φ = 13547520.

The previous prime is 21124099. The next prime is 21124123. The reversal of 21124113 is 31142112.

It is not a de Polignac number, because 21124113 - 2⁸ = 21123857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21124092 and 21124101.

It is not an unprimeable number, because it can be changed into a prime (21124123) 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, 17745 + ... + 18897.

It is an arithmetic number, because the mean of its divisors is an integer number (1827936).

Almost surely, 2^21124113 is an apocalyptic number.

It is an amenable number.

21124113 is a deficient number, since it is larger than the sum of its proper divisors (8122863).

21124113 is a wasteful number, since it uses less digits than its factorization.

21124113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384.

The product of its digits is 48, while the sum is 15.

The square root of 21124113 is about 4596.0975838204. The cubic root of 21124113 is about 276.4348715779.

Adding to 21124113 its reverse (31142112), we get a palindrome (52266225).

The spelling of 21124113 in words is "twenty-one million, one hundred twenty-four thousand, one hundred thirteen".