21122001011105 has 8 divisors (see below), whose sum is σ = 25346426085672. Its totient is φ = 16897584227328.

The previous prime is 21122001011099. The next prime is 21122001011197. The reversal of 21122001011105 is 50111010022112.

It can be written as a sum of positive squares in 4 ways, for example, as 11543570241889 + 9578430769216 = 3397583^2 + 3094904^2 .

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 21122001011105 - 2¹⁰ = 21122001010081 is a prime.

It is a super-2 number, since 2×21122001011105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7854767 + ... + 10195163.

It is an arithmetic number, because the mean of its divisors is an integer number (3168303260709).

Almost surely, 2^{21122001011105} is an apocalyptic number.

It is an amenable number.

21122001011105 is a deficient number, since it is larger than the sum of its proper divisors (4224425074567).

21122001011105 is a wasteful number, since it uses less digits than its factorization.

21122001011105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4145395.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 21122001011105 its reverse (50111010022112), we get a palindrome (71233011033217).

The spelling of 21122001011105 in words is "twenty-one trillion, one hundred twenty-two billion, one million, eleven thousand, one hundred five".