20202121111211 has 16 divisors (see below), whose sum is σ = 22907028695040. Its totient is φ = 17662128032160.

The previous prime is 20202121111141. The next prime is 20202121111213. The reversal of 20202121111211 is 11211112120202.

It is a cyclic number.

It is not a de Polignac number, because 20202121111211 - 2¹⁰ = 20202121110187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20202121111211.

It is not an unprimeable number, because it can be changed into a prime (20202121111213) 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, 9455435 + ... + 11393396.

It is an arithmetic number, because the mean of its divisors is an integer number (1431689293440).

Almost surely, 2^{20202121111211} is an apocalyptic number.

20202121111211 is a deficient number, since it is larger than the sum of its proper divisors (2704907583829).

20202121111211 is a wasteful number, since it uses less digits than its factorization.

20202121111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20852786.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20202121111211 its reverse (11211112120202), we get a palindrome (31413233231413).

The spelling of 20202121111211 in words is "twenty trillion, two hundred two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred eleven".