212111212121010 has 72 divisors (see below), whose sum is σ = 566797104917316. Its totient is φ = 55034260410240.

The previous prime is 212111212120991. The next prime is 212111212121023. The reversal of 212111212121010 is 10121212111212.

It is a happy number.

212111212121010 is a `hidden beast` number, since 21 + 211 + 1 + 212 + 1 + 210 + 10 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 176856937745049 + 35254274375961 = 13298757^2 + 5937531^2 .

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, 860647881 + ... + 860894300.

Almost surely, 2^{212111212121010} is an apocalyptic number.

212111212121010 is an abundant number, since it is smaller than the sum of its proper divisors (354685892796306).

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

212111212121010 is a wasteful number, since it uses less digits than its factorization.

212111212121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721542268 (or 1721542228 counting only the distinct ones).

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

Adding to 212111212121010 its reverse (10121212111212), we get a palindrome (222232424232222).

The spelling of 212111212121010 in words is "two hundred twelve trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, ten".