821212212104 has 32 divisors (see below), whose sum is σ = 1633097256120. Its totient is φ = 385801076736.

The previous prime is 821212212077. The next prime is 821212212137. The reversal of 821212212104 is 401212212128.

It can be written as a sum of positive squares in 4 ways, for example, as 806206452100 + 15005760004 = 897890^2 + 122498^2 .

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, 5010689 + ... + 5171984.

Almost surely, 2^821212212104 is an apocalyptic number.

It is an amenable number.

821212212104 is a deficient number, since it is larger than the sum of its proper divisors (811885044016).

821212212104 is a wasteful number, since it uses less digits than its factorization.

821212212104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10183289 (or 10183285 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The spelling of 821212212104 in words is "eight hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred four".