212121033210 has 48 divisors (see below), whose sum is σ = 554561771400. Its totient is φ = 56253087360.

The previous prime is 212121033203. The next prime is 212121033239. The reversal of 212121033210 is 12330121212.

212121033210 is a `hidden beast` number, since 2 + 121 + 210 + 332 + 1 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 134666246961 + 77454786249 = 366969^2 + 278307^2 .

It is a super-3 number, since 3×212121033210³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6494485 + ... + 6527064.

Almost surely, 2^212121033210 is an apocalyptic number.

212121033210 is an abundant number, since it is smaller than the sum of its proper divisors (342440738190).

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

212121033210 is a wasteful number, since it uses less digits than its factorization.

212121033210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13021743 (or 13021740 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 212121033210 its reverse (12330121212), we get a palindrome (224451154422).

The spelling of 212121033210 in words is "two hundred twelve billion, one hundred twenty-one million, thirty-three thousand, two hundred ten".