10111211221 has 8 divisors (see below), whose sum is σ = 10515970784. Its totient is φ = 9714161520.

The previous prime is 10111211213. The next prime is 10111211249. The reversal of 10111211221 is 12211211101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 10111211221 - 2³ = 10111211213 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 (10111211281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924791 + ... + 1930036.

It is an arithmetic number, because the mean of its divisors is an integer number (1314496348).

Almost surely, 2^10111211221 is an apocalyptic number.

It is an amenable number.

10111211221 is a deficient number, since it is larger than the sum of its proper divisors (404759563).

10111211221 is an equidigital number, since it uses as much as digits as its factorization.

10111211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3854931.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10111211221 its reverse (12211211101), we get a palindrome (22322422322).

The spelling of 10111211221 in words is "ten billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty-one".