2121022221012 has 48 divisors (see below), whose sum is σ = 5499109062720. Its totient is φ = 706986506016.

The previous prime is 2121022221011. The next prime is 2121022221037. The reversal of 2121022221012 is 2101222201212.

It is a happy number.

2121022221012 is a `hidden beast` number, since 21 + 210 + 222 + 210 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121022221011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3622978 + ... + 4167494.

It is an arithmetic number, because the mean of its divisors is an integer number (114564772140).

Almost surely, 2^{2121022221012} is an apocalyptic number.

It is an amenable number.

2121022221012 is an abundant number, since it is smaller than the sum of its proper divisors (3378086841708).

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

2121022221012 is a wasteful number, since it uses less digits than its factorization.

2121022221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580597 (or 580589 counting only the distinct ones).

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

Adding to 2121022221012 its reverse (2101222201212), we get a palindrome (4222244422224).

The spelling of 2121022221012 in words is "two trillion, one hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, twelve".