212121100212 has 48 divisors (see below), whose sum is σ = 565827440640. Its totient is φ = 60587688672.

The previous prime is 212121100133. The next prime is 212121100241. The reversal of 212121100212 is 212001121212.

It is a super-3 number, since 3×212121100212³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 212121100191 and 212121100200.

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, 101628 + ... + 659219.

It is an arithmetic number, because the mean of its divisors is an integer number (11788071680).

Almost surely, 2^212121100212 is an apocalyptic number.

It is an amenable number.

212121100212 is an abundant number, since it is smaller than the sum of its proper divisors (353706340428).

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

212121100212 is a wasteful number, since it uses less digits than its factorization.

212121100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764180 (or 764178 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212121100212 its reverse (212001121212), we get a palindrome (424122221424).

The spelling of 212121100212 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred thousand, two hundred twelve".