2121202021212 has 72 divisors (see below), whose sum is σ = 5536210173312. Its totient is φ = 684095846400.

The previous prime is 2121202021129. The next prime is 2121202021219.

It is a happy number.

2121202021212 is nontrivially palindromic in base 10.

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 (2121202021219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4508868 + ... + 4957044.

Almost surely, 2^{2121202021212} is an apocalyptic number.

It is an amenable number.

2121202021212 is an abundant number, since it is smaller than the sum of its proper divisors (3415008152100).

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

2121202021212 is a wasteful number, since it uses less digits than its factorization.

2121202021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452459 (or 452454 counting only the distinct ones).

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

The spelling of 2121202021212 in words is "two trillion, one hundred twenty-one billion, two hundred two million, twenty-one thousand, two hundred twelve".