7821212012 has 12 divisors (see below), whose sum is σ = 13688871336. Its totient is φ = 3910105920.

The previous prime is 7821212011. The next prime is 7821212023. The reversal of 7821212012 is 2102121287.

It is a super-2 number, since 2×7821212012² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7821212011) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 88658 + ... + 153305.

It is an arithmetic number, because the mean of its divisors is an integer number (1140739278).

Almost surely, 2^7821212012 is an apocalyptic number.

It is an amenable number.

7821212012 is a deficient number, since it is larger than the sum of its proper divisors (5867659324).

7821212012 is a wasteful number, since it uses less digits than its factorization.

7821212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250048 (or 250046 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 7821212012 is about 88437.6164988632. The cubic root of 7821212012 is about 1984.9886120063.

Adding to 7821212012 its reverse (2102121287), we get a palindrome (9923333299).

The spelling of 7821212012 in words is "seven billion, eight hundred twenty-one million, two hundred twelve thousand, twelve".