121220221212 has 36 divisors (see below), whose sum is σ = 316983914520. Its totient is φ = 39013404192.

The previous prime is 121220221169. The next prime is 121220221247. The reversal of 121220221212 is 212122022121.

It is a happy number.

121220221212 is a `hidden beast` number, since 1 + 212 + 20 + 221 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58054618 + ... + 58056705.

Almost surely, 2^121220221212 is an apocalyptic number.

121220221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121220221212 is an abundant number, since it is smaller than the sum of its proper divisors (195763693308).

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

121220221212 is a wasteful number, since it uses less digits than its factorization.

121220221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116111362 (or 116111357 counting only the distinct ones).

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

Adding to 121220221212 its reverse (212122022121), we get a palindrome (333342243333).

It can be divided in two parts, 12122022121 and 2, that multiplied together give a palindrome (24244044242).

The spelling of 121220221212 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twelve".