2121221011212 has 96 divisors (see below), whose sum is σ = 5526239631360. Its totient is φ = 703633262400.

The previous prime is 2121221011207. The next prime is 2121221011243. The reversal of 2121221011212 is 2121101221212.

2121221011212 is a `hidden beast` number, since 21 + 212 + 210 + 11 + 212 = 666.

It is a super-3 number, since 3×2121221011212³ (a number of 38 digits) contains 333 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 31 ways as a sum of consecutive naturals, for example, 68648038 + ... + 68678930.

It is an arithmetic number, because the mean of its divisors is an integer number (57564996160).

Almost surely, 2^{2121221011212} 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 2121221011212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2763119815680).

2121221011212 is an abundant number, since it is smaller than the sum of its proper divisors (3405018620148).

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

2121221011212 is a wasteful number, since it uses less digits than its factorization.

2121221011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33980 (or 33972 counting only the distinct ones).

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

Adding to 2121221011212 its reverse (2121101221212), we get a palindrome (4242322232424).

The spelling of 2121221011212 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, eleven thousand, two hundred twelve".