83121212 has 6 divisors (see below), whose sum is σ = 145462128. Its totient is φ = 41560604.

The previous prime is 83121209. The next prime is 83121217. The reversal of 83121212 is 21212138.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83121217) 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 as a sum of consecutive naturals, namely, 10390148 + ... + 10390155.

It is an arithmetic number, because the mean of its divisors is an integer number (24243688).

Almost surely, 2^83121212 is an apocalyptic number.

It is an amenable number.

83121212 is a deficient number, since it is larger than the sum of its proper divisors (62340916).

83121212 is a wasteful number, since it uses less digits than its factorization.

83121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20780307 (or 20780305 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 83121212 is about 9117.0835248998. The cubic root of 83121212 is about 436.4193073596.

The spelling of 83121212 in words is "eighty-three million, one hundred twenty-one thousand, two hundred twelve".