2121022111212 has 72 divisors (see below), whose sum is σ = 5453149455936. Its totient is φ = 694963314144.

The previous prime is 2121022111199. The next prime is 2121022111237. The reversal of 2121022111212 is 2121112201212.

2121022111212 is a `hidden beast` number, since 21 + 210 + 221 + 1 + 1 + 212 = 666.

It is a super-3 number, since 3×2121022111212³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 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 23 ways as a sum of consecutive naturals, for example, 184903 + ... + 2067905.

It is an arithmetic number, because the mean of its divisors is an integer number (75738186888).

Almost surely, 2^{2121022111212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121022111212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2726574727968).

2121022111212 is an abundant number, since it is smaller than the sum of its proper divisors (3332127344724).

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

2121022111212 is a wasteful number, since it uses less digits than its factorization.

2121022111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883547 (or 1883542 counting only the distinct ones).

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

Adding to 2121022111212 its reverse (2121112201212), we get a palindrome (4242134312424).

The spelling of 2121022111212 in words is "two trillion, one hundred twenty-one billion, twenty-two million, one hundred eleven thousand, two hundred twelve".