21212020220211 has 24 divisors (see below), whose sum is σ = 31677146848256. Its totient is φ = 13663890900720.

The previous prime is 21212020220201. The next prime is 21212020220213. The reversal of 21212020220211 is 11202202021212.

It is a happy number.

21212020220211 is a `hidden beast` number, since 2 + 1 + 212 + 0 + 20 + 220 + 211 = 666.

It is not a de Polignac number, because 21212020220211 - 2⁵ = 21212020220179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212020220213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58940935 + ... + 59299728.

Almost surely, 2^{21212020220211} is an apocalyptic number.

21212020220211 is a deficient number, since it is larger than the sum of its proper divisors (10465126628045).

21212020220211 is a wasteful number, since it uses less digits than its factorization.

21212020220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118241343 (or 118241340 counting only the distinct ones).

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

Adding to 21212020220211 its reverse (11202202021212), we get a palindrome (32414222241423).

The spelling of 21212020220211 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred twenty thousand, two hundred eleven".