821212212103 has 8 divisors (see below), whose sum is σ = 840713675648. Its totient is φ = 801729089784.

The previous prime is 821212212077. The next prime is 821212212137. The reversal of 821212212103 is 301212212128.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 821212212103 - 2²¹ = 821210114951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821212212143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4494675 + ... + 4673812.

It is an arithmetic number, because the mean of its divisors is an integer number (105089209456).

Almost surely, 2^821212212103 is an apocalyptic number.

821212212103 is a deficient number, since it is larger than the sum of its proper divisors (19501463545).

821212212103 is a wasteful number, since it uses less digits than its factorization.

821212212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9170613.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 821212212103 its sum of digits (25), we get a palindrome (821212212128).

The spelling of 821212212103 in words is "eight hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred three".