10111212112 has 20 divisors (see below), whose sum is σ = 19592999316. Its totient is φ = 5054954240.

The previous prime is 10111212109. The next prime is 10111212113. The reversal of 10111212112 is 21121211101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7254950976 + 2856261136 = 85176^2 + 53444^2 .

It is a super-2 number, since 2×10111212112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10111212092 and 10111212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111212113) 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, 102498 + ... + 175294.

Almost surely, 2^10111212112 is an apocalyptic number.

It is an amenable number.

10111212112 is a deficient number, since it is larger than the sum of its proper divisors (9481787204).

10111212112 is an equidigital number, since it uses as much as digits as its factorization.

10111212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81486 (or 81480 counting only the distinct ones).

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

Adding to 10111212112 its reverse (21121211101), we get a palindrome (31232423213).

The spelling of 10111212112 in words is "ten billion, one hundred eleven million, two hundred twelve thousand, one hundred twelve".