121212202212 has 18 divisors (see below), whose sum is σ = 306397511238. Its totient is φ = 40404067392.

The previous prime is 121212202211. The next prime is 121212202289. The reversal of 121212202212 is 212202212121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 120453420096 + 758782116 = 347064^2 + 27546^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is not an unprimeable number, because it can be changed into a prime (121212202211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1683502773 + ... + 1683502844.

Almost surely, 2^121212202212 is an apocalyptic number.

121212202212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121212202212 is an abundant number, since it is smaller than the sum of its proper divisors (185185309026).

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

121212202212 is a wasteful number, since it uses less digits than its factorization.

121212202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367005627 (or 3367005622 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121212202212 its reverse (212202212121), we get a palindrome (333414414333).

Subtracting 121212202212 from its reverse (212202212121), we obtain a palindrome (90990009909).

It can be divided in two parts, 121 and 212202212, that multiplied together give a palindrome (25676467652).

The spelling of 121212202212 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred twelve".