21124130411 has 4 divisors (see below), whose sum is σ = 21125004432. Its totient is φ = 21123256392.

The previous prime is 21124130393. The next prime is 21124130449. The reversal of 21124130411 is 11403142112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21124130411 - 2⁶ = 21124130347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124130471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399695 + ... + 449448.

It is an arithmetic number, because the mean of its divisors is an integer number (5281251108).

Almost surely, 2^21124130411 is an apocalyptic number.

21124130411 is a deficient number, since it is larger than the sum of its proper divisors (874021).

21124130411 is an equidigital number, since it uses as much as digits as its factorization.

21124130411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874020.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21124130411 its reverse (11403142112), we get a palindrome (32527272523).

The spelling of 21124130411 in words is "twenty-one billion, one hundred twenty-four million, one hundred thirty thousand, four hundred eleven".