121221212 has 24 divisors (see below), whose sum is σ = 242803680. Its totient is φ = 51874560.

The previous prime is 121221209. The next prime is 121221227. The reversal of 121221212 is 212122121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18464 + ... + 24152.

It is an arithmetic number, because the mean of its divisors is an integer number (10116820).

Almost surely, 2^121221212 is an apocalyptic number.

It is an amenable number.

121221212 is an abundant number, since it is smaller than the sum of its proper divisors (121582468).

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

121221212 is a wasteful number, since it uses less digits than its factorization.

121221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461 (or 6459 counting only the distinct ones).

The product of its digits is 32, while the sum is 14.

The square root of 121221212 is about 11010.0504994301. The cubic root of 121221212 is about 494.9099751258.

Adding to 121221212 its reverse (212122121), we get a palindrome (333343333).

Subtracting 121221212 from its reverse (212122121), we obtain a palindrome (90900909).

It can be divided in two parts, 12122121 and 2, that multiplied together give a palindrome (24244242).

The spelling of 121221212 in words is "one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".