121211110212 has 12 divisors (see below), whose sum is σ = 282825923856. Its totient is φ = 40403703400.

The previous prime is 121211110201. The next prime is 121211110213. The reversal of 121211110212 is 212011112121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×121211110212² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121211110191 and 121211110200.

It is not an unprimeable number, because it can be changed into a prime (121211110213) 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, 5050462914 + ... + 5050462937.

It is an arithmetic number, because the mean of its divisors is an integer number (23568826988).

Almost surely, 2^121211110212 is an apocalyptic number.

121211110212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121211110212 is an abundant number, since it is smaller than the sum of its proper divisors (161614813644).

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

121211110212 is a wasteful number, since it uses less digits than its factorization.

121211110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100925858 (or 10100925856 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211110212 its reverse (212011112121), we get a palindrome (333222222333).

The spelling of 121211110212 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred ten thousand, two hundred twelve".