21124122105 has 16 divisors (see below), whose sum is σ = 33829714944. Its totient is φ = 11255825280.

The previous prime is 21124122059. The next prime is 21124122127. The reversal of 21124122105 is 50122142112.

It is not a de Polignac number, because 21124122105 - 2⁸ = 21124121849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 631476 + ... + 664085.

It is an arithmetic number, because the mean of its divisors is an integer number (2114357184).

Almost surely, 2^21124122105 is an apocalyptic number.

It is an amenable number.

21124122105 is a deficient number, since it is larger than the sum of its proper divisors (12705592839).

21124122105 is a wasteful number, since it uses less digits than its factorization.

21124122105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296656.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 21124122105 its reverse (50122142112), we get a palindrome (71246264217).

The spelling of 21124122105 in words is "twenty-one billion, one hundred twenty-four million, one hundred twenty-two thousand, one hundred five".