10111222121 has 64 divisors (see below), whose sum is σ = 13917173760. Its totient is φ = 7092264960.

The previous prime is 10111222111. The next prime is 10111222123. The reversal of 10111222121 is 12122211101.

It is a de Polignac number, because none of the positive numbers 2^k-10111222121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10111222096 and 10111222105.

It is not an unprimeable number, because it can be changed into a prime (10111222123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7175465 + ... + 7176873.

It is an arithmetic number, because the mean of its divisors is an integer number (217455840).

Almost surely, 2^10111222121 is an apocalyptic number.

10111222121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10111222121 is a deficient number, since it is larger than the sum of its proper divisors (3805951639).

10111222121 is a wasteful number, since it uses less digits than its factorization.

10111222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10111222121 its reverse (12122211101), we get a palindrome (22233433222).

It can be divided in two parts, 10111 and 222121, that added together give a palindrome (232232).

The spelling of 10111222121 in words is "ten billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".