21110124771 has 32 divisors (see below), whose sum is σ = 31874688000. Its totient is φ = 13805225280.

The previous prime is 21110124769. The next prime is 21110124823. The reversal of 21110124771 is 17742101112.

It is not a de Polignac number, because 21110124771 - 2¹ = 21110124769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21110124071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353815 + ... + 409151.

It is an arithmetic number, because the mean of its divisors is an integer number (996084000).

Almost surely, 2^21110124771 is an apocalyptic number.

21110124771 is a deficient number, since it is larger than the sum of its proper divisors (10764563229).

21110124771 is a wasteful number, since it uses less digits than its factorization.

21110124771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55616 (or 55610 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

Adding to 21110124771 its reverse (17742101112), we get a palindrome (38852225883).

The spelling of 21110124771 in words is "twenty-one billion, one hundred ten million, one hundred twenty-four thousand, seven hundred seventy-one".