20202212122221 has 16 divisors (see below), whose sum is σ = 28077190341824. Its totient is φ = 12908553444864.

The previous prime is 20202212122219. The next prime is 20202212122229. The reversal of 20202212122221 is 12222121220202.

It is not a de Polignac number, because 20202212122221 - 2¹ = 20202212122219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202212122229) 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, 1358215780 + ... + 1358230653.

It is an arithmetic number, because the mean of its divisors is an integer number (1754824396364).

Almost surely, 2^{20202212122221} is an apocalyptic number.

It is an amenable number.

20202212122221 is a deficient number, since it is larger than the sum of its proper divisors (7874978219603).

20202212122221 is a wasteful number, since it uses less digits than its factorization.

20202212122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716446540.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 20202212122221 its reverse (12222121220202), we get a palindrome (32424333342423).

The spelling of 20202212122221 in words is "twenty trillion, two hundred two billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".