212212122210 has 256 divisors, whose sum is σ = 622271808000. Its totient is φ = 51036687360.

The previous prime is 212212122193. The next prime is 212212122247. The reversal of 212212122210 is 12221212212.

It is a happy number.

212212122210 is a `hidden beast` number, since 21 + 221 + 212 + 2 + 210 = 666.

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 127 ways as a sum of consecutive naturals, for example, 346185864 + ... + 346186476.

It is an arithmetic number, because the mean of its divisors is an integer number (2430749250).

Almost surely, 2^212212122210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212212122210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311135904000).

212212122210 is an abundant number, since it is smaller than the sum of its proper divisors (410059685790).

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

212212122210 is a wasteful number, since it uses less digits than its factorization.

212212122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378 (or 1372 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212212122210 its reverse (12221212212), we get a palindrome (224433334422).

The spelling of 212212122210 in words is "two hundred twelve billion, two hundred twelve million, one hundred twenty-two thousand, two hundred ten".