10111212220111 has 4 divisors (see below), whose sum is σ = 10114528462000. Its totient is φ = 10107895978224.

The previous prime is 10111212220069. The next prime is 10111212220163. The reversal of 10111212220111 is 11102221211101.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10111212220111 is a prime.

It is a super-2 number, since 2×10111212220111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111212220171) 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, 1658116371 + ... + 1658122468.

It is an arithmetic number, because the mean of its divisors is an integer number (2528632115500).

Almost surely, 2^{10111212220111} is an apocalyptic number.

10111212220111 is a deficient number, since it is larger than the sum of its proper divisors (3316241889).

10111212220111 is an equidigital number, since it uses as much as digits as its factorization.

10111212220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316241888.

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

Adding to 10111212220111 its reverse (11102221211101), we get a palindrome (21213433431212).

The spelling of 10111212220111 in words is "ten trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, one hundred eleven".