10111212112221 has 48 divisors (see below), whose sum is σ = 16365827819328. Its totient is φ = 5961513945600.

The previous prime is 10111212112163. The next prime is 10111212112237. The reversal of 10111212112221 is 12221121211101.

It is a happy number.

10111212112221 is a `hidden beast` number, since 10 + 111 + 212 + 112 + 221 = 666.

It is not a de Polignac number, because 10111212112221 - 2¹⁴ = 10111212095837 is a prime.

It is a super-2 number, since 2×10111212112221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10111212112194 and 10111212112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111212112291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25299870 + ... + 25696416.

It is an arithmetic number, because the mean of its divisors is an integer number (340954746236).

Almost surely, 2^{10111212112221} is an apocalyptic number.

10111212112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10111212112221 is a deficient number, since it is larger than the sum of its proper divisors (6254615707107).

10111212112221 is a wasteful number, since it uses less digits than its factorization.

10111212112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403562 (or 403559 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 10111212112221 its reverse (12221121211101), we get a palindrome (22332333323322).

The spelling of 10111212112221 in words is "ten trillion, one hundred eleven billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".