21011050105 has 8 divisors (see below), whose sum is σ = 25228843200. Its totient is φ = 16798451376.

The previous prime is 21011050097. The next prime is 21011050127. The reversal of 21011050105 is 50105011012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011050105 - 2³ = 21011050097 is a prime.

It is a super-2 number, since 2×21011050105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1289685 + ... + 1305874.

It is an arithmetic number, because the mean of its divisors is an integer number (3153605400).

Almost surely, 2^21011050105 is an apocalyptic number.

It is an amenable number.

21011050105 is a deficient number, since it is larger than the sum of its proper divisors (4217793095).

21011050105 is a wasteful number, since it uses less digits than its factorization.

21011050105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597183.

The product of its (nonzero) digits is 50, while the sum is 16.

Adding to 21011050105 its reverse (50105011012), we get a palindrome (71116061117).

The spelling of 21011050105 in words is "twenty-one billion, eleven million, fifty thousand, one hundred five".