20110101021205 has 64 divisors (see below), whose sum is σ = 26946666819072. Its totient is φ = 14313171640320.

The previous prime is 20110101021193. The next prime is 20110101021221. The reversal of 20110101021205 is 50212010101102.

It is a de Polignac number, because none of the positive numbers 2^k-20110101021205 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 80771389 + ... + 81019981.

It is an arithmetic number, because the mean of its divisors is an integer number (421041669048).

Almost surely, 2^{20110101021205} is an apocalyptic number.

It is an amenable number.

20110101021205 is a deficient number, since it is larger than the sum of its proper divisors (6836565797867).

20110101021205 is a wasteful number, since it uses less digits than its factorization.

20110101021205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249038.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 20110101021205 its reverse (50212010101102), we get a palindrome (70322111122307).

The spelling of 20110101021205 in words is "twenty trillion, one hundred ten billion, one hundred one million, twenty-one thousand, two hundred five".