821212212126 has 32 divisors (see below), whose sum is σ = 1677463603200. Its totient is φ = 267898193696.

The previous prime is 821212212077. The next prime is 821212212137. The reversal of 821212212126 is 621212212128.

It is a junction number, because it is equal to n+sod(n) for n = 821212212093 and 821212212102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5681140 + ... + 5823896.

It is an arithmetic number, because the mean of its divisors is an integer number (52420737600).

Almost surely, 2^821212212126 is an apocalyptic number.

821212212126 is an abundant number, since it is smaller than the sum of its proper divisors (856251391074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821212212126 is a wasteful number, since it uses less digits than its factorization.

821212212126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163208.

The product of its digits is 3072, while the sum is 30.

The spelling of 821212212126 in words is "eight hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-six".