20110121011205 has 8 divisors (see below), whose sum is σ = 24137186425632. Its totient is φ = 16084736000848.

The previous prime is 20110121011181. The next prime is 20110121011207. The reversal of 20110121011205 is 50211012101102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110121011205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110121011207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420074687 + ... + 420122556.

It is an arithmetic number, because the mean of its divisors is an integer number (3017148303204).

Almost surely, 2^{20110121011205} is an apocalyptic number.

It is an amenable number.

20110121011205 is a deficient number, since it is larger than the sum of its proper divisors (4027065414427).

20110121011205 is an equidigital number, since it uses as much as digits as its factorization.

20110121011205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840202035.

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

Adding to 20110121011205 its reverse (50211012101102), we get a palindrome (70321133112307).

The spelling of 20110121011205 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, eleven thousand, two hundred five".