21124100511 has 16 divisors (see below), whose sum is σ = 32374101600. Its totient is φ = 13597121664.

The previous prime is 21124100489. The next prime is 21124100531. The reversal of 21124100511 is 11500142112.

21124100511 is a `hidden beast` number, since 2 + 112 + 41 + 0 + 0 + 511 = 666.

It is not a de Polignac number, because 21124100511 - 2⁵ = 21124100479 is a prime.

It is a super-2 number, since 2×21124100511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124100531) 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, 13488426 + ... + 13489991.

It is an arithmetic number, because the mean of its divisors is an integer number (2023381350).

Almost surely, 2^21124100511 is an apocalyptic number.

21124100511 is a deficient number, since it is larger than the sum of its proper divisors (11250001089).

21124100511 is a wasteful number, since it uses less digits than its factorization.

21124100511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26978455 (or 26978449 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 21124100511 its reverse (11500142112), we get a palindrome (32624242623).

The spelling of 21124100511 in words is "twenty-one billion, one hundred twenty-four million, one hundred thousand, five hundred eleven".