77121212 has 12 divisors (see below), whose sum is σ = 154242480. Its totient is φ = 33051936.

The previous prime is 77121203. The next prime is 77121217. The reversal of 77121212 is 21212177.

77121212 is an admirable number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77121217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1377137 + ... + 1377192.

It is an arithmetic number, because the mean of its divisors is an integer number (12853540).

Almost surely, 2^77121212 is an apocalyptic number.

It is an amenable number.

77121212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

77121212 is a wasteful number, since it uses less digits than its factorization.

77121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754340 (or 2754338 counting only the distinct ones).

The product of its digits is 392, while the sum is 23.

The square root of 77121212 is about 8781.8683661280. The cubic root of 77121212 is about 425.6552052944.

Adding to 77121212 its reverse (21212177), we get a palindrome (98333389).

The spelling of 77121212 in words is "seventy-seven million, one hundred twenty-one thousand, two hundred twelve".