10121111221212 has 96 divisors (see below), whose sum is σ = 26517304755200. Its totient is φ = 3338057765376.

The previous prime is 10121111221211. The next prime is 10121111221259. The reversal of 10121111221212 is 21212211112101.

It is a happy number.

10121111221212 is a `hidden beast` number, since 1 + 0 + 121 + 111 + 221 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121111221211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40932183 + ... + 41178705.

Almost surely, 2^{10121111221212} is an apocalyptic number.

10121111221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10121111221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13258652377600).

10121111221212 is an abundant number, since it is smaller than the sum of its proper divisors (16396193533988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10121111221212 is a wasteful number, since it uses less digits than its factorization.

10121111221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250552 (or 250544 counting only the distinct ones).

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

Adding to 10121111221212 its reverse (21212211112101), we get a palindrome (31333322333313).

The spelling of 10121111221212 in words is "ten trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twelve".