10111212111211 has 4 divisors (see below), whose sum is σ = 10121134793400. Its totient is φ = 10101289429024.

The previous prime is 10111212111179. The next prime is 10111212111271. The reversal of 10111212111211 is 11211121211101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10111212111211 - 2⁵ = 10111212111179 is a prime.

It is a super-2 number, since 2×10111212111211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10111212111271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4961339566 + ... + 4961341603.

It is an arithmetic number, because the mean of its divisors is an integer number (2530283698350).

Almost surely, 2^{10111212111211} is an apocalyptic number.

10111212111211 is a deficient number, since it is larger than the sum of its proper divisors (9922682189).

10111212111211 is an equidigital number, since it uses as much as digits as its factorization.

10111212111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9922682188.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 10111212111211 its reverse (11211121211101), we get a palindrome (21322333322312).

The spelling of 10111212111211 in words is "ten trillion, one hundred eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred eleven".