212021111112210 has 72 divisors (see below), whose sum is σ = 566556339752676. Its totient is φ = 55010882851200.

The previous prime is 212021111112179. The next prime is 212021111112227. The reversal of 212021111112210 is 12211111120212.

It is a happy number.

212021111112210 is a `hidden beast` number, since 2 + 120 + 211 + 1 + 111 + 221 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 139663682207721 + 72357428904489 = 11817939^2 + 8506317^2 .

It is a super-2 number, since 2×212021111112210² (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 an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 860282241 + ... + 860528660.

Almost surely, 2^{212021111112210} is an apocalyptic number.

212021111112210 is an abundant number, since it is smaller than the sum of its proper divisors (354535228640466).

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

212021111112210 is a wasteful number, since it uses less digits than its factorization.

212021111112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720810988 (or 1720810948 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212021111112210 its reverse (12211111120212), we get a palindrome (224232222232422).

The spelling of 212021111112210 in words is "two hundred twelve trillion, twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred ten".