212212121010 has 64 divisors (see below), whose sum is σ = 523699948800. Its totient is φ = 54994574592.

The previous prime is 212212120993. The next prime is 212212121081. The reversal of 212212121010 is 10121212212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 817356 + ... + 1045224.

It is an arithmetic number, because the mean of its divisors is an integer number (8182811700).

Almost surely, 2^212212121010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212212121010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261849974400).

212212121010 is an abundant number, since it is smaller than the sum of its proper divisors (311487827790).

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

212212121010 is a wasteful number, since it uses less digits than its factorization.

212212121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228755.

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

Adding to 212212121010 its reverse (10121212212), we get a palindrome (222333333222).

The spelling of 212212121010 in words is "two hundred twelve billion, two hundred twelve million, one hundred twenty-one thousand, ten".