21020202212211 has 24 divisors (see below), whose sum is σ = 31183378749120. Its totient is φ = 13634613847296.

The previous prime is 21020202212209. The next prime is 21020202212249. The reversal of 21020202212211 is 11221220202012.

It is a happy number.

21020202212211 is a `hidden beast` number, since 21 + 0 + 20 + 202 + 212 + 211 = 666.

It is not a de Polignac number, because 21020202212211 - 2¹ = 21020202212209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020202222211) 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, 65079931 + ... + 65402123.

It is an arithmetic number, because the mean of its divisors is an integer number (1299307447880).

Almost surely, 2^{21020202212211} is an apocalyptic number.

21020202212211 is a deficient number, since it is larger than the sum of its proper divisors (10163176536909).

21020202212211 is a wasteful number, since it uses less digits than its factorization.

21020202212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518155 (or 518152 counting only the distinct ones).

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

Adding to 21020202212211 its reverse (11221220202012), we get a palindrome (32241422414223).

The spelling of 21020202212211 in words is "twenty-one trillion, twenty billion, two hundred two million, two hundred twelve thousand, two hundred eleven".