2121222221212 has 12 divisors (see below), whose sum is σ = 3724808305176. Its totient is φ = 1056991276880.

The previous prime is 2121222221201. The next prime is 2121222221213.

2121222221212 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121222221213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904957114 + ... + 904959457.

It is an arithmetic number, because the mean of its divisors is an integer number (310400692098).

Almost surely, 2^{2121222221212} is an apocalyptic number.

It is an amenable number.

2121222221212 is a deficient number, since it is larger than the sum of its proper divisors (1603586083964).

2121222221212 is a wasteful number, since it uses less digits than its factorization.

2121222221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809916868 (or 1809916866 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

Multiplying 2121222221212 by its sum of digits (22), we get a palindrome (46666888866664).

The spelling of 2121222221212 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twelve".