21202123202212 has 24 divisors (see below), whose sum is σ = 38383464268800. Its totient is φ = 10235425034016.

The previous prime is 21202123202201. The next prime is 21202123202219. The reversal of 21202123202212 is 21220232120212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21202123202219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15142603 + ... + 16483405.

It is an arithmetic number, because the mean of its divisors is an integer number (1599311011200).

Almost surely, 2^{21202123202212} is an apocalyptic number.

It is an amenable number.

21202123202212 is a deficient number, since it is larger than the sum of its proper divisors (17181341066588).

21202123202212 is a wasteful number, since it uses less digits than its factorization.

21202123202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477155 (or 1477153 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21202123202212 its reverse (21220232120212), we get a palindrome (42422355322424).

The spelling of 21202123202212 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-three million, two hundred two thousand, two hundred twelve".