212121202011210 has 32 divisors (see below), whose sum is σ = 565656538697280. Its totient is φ = 56565653869584.

The previous prime is 212121202011167. The next prime is 212121202011211. The reversal of 212121202011210 is 12110202121212.

212121202011210 is a `hidden beast` number, since 21 + 21 + 212 + 0 + 201 + 1 + 210 = 666.

It is a super-2 number, since 2×212121202011210² (a number of 29 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (212121202011211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392817040492 + ... + 392817041031.

It is an arithmetic number, because the mean of its divisors is an integer number (17676766834290).

Almost surely, 2^{212121202011210} is an apocalyptic number.

212121202011210 is an abundant number, since it is smaller than the sum of its proper divisors (353535336686070).

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

212121202011210 is a wasteful number, since it uses less digits than its factorization.

212121202011210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785634081539 (or 785634081533 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212121202011210 its reverse (12110202121212), we get a palindrome (224231404132422).

The spelling of 212121202011210 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred two million, eleven thousand, two hundred ten".