7821211612 has 6 divisors (see below), whose sum is σ = 13687120328. Its totient is φ = 3910605804.

The previous prime is 7821211603. The next prime is 7821211633. The reversal of 7821211612 is 2161121287.

It is a super-2 number, since 2×7821211612² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977651448 + ... + 977651455.

Almost surely, 2^7821211612 is an apocalyptic number.

It is an amenable number.

7821211612 is a deficient number, since it is larger than the sum of its proper divisors (5865908716).

7821211612 is a wasteful number, since it uses less digits than its factorization.

7821211612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955302907 (or 1955302905 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 7821211612 is about 88437.6142373820. The cubic root of 7821211612 is about 1984.9885781669.

Adding to 7821211612 its reverse (2161121287), we get a palindrome (9982332899).

The spelling of 7821211612 in words is "seven billion, eight hundred twenty-one million, two hundred eleven thousand, six hundred twelve".