212121122020011 has 64 divisors (see below), whose sum is σ = 322845291578880. Its totient is φ = 137600089200000.

The previous prime is 212121122020001. The next prime is 212121122020037. The reversal of 212121122020011 is 110020221121212.

212121122020011 is a `hidden beast` number, since 2 + 1 + 21 + 211 + 220 + 200 + 11 = 666.

It is not a de Polignac number, because 212121122020011 - 2³⁵ = 212086762281643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212121122020001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 192913336 + ... + 194009786.

It is an arithmetic number, because the mean of its divisors is an integer number (5044457680920).

Almost surely, 2^{212121122020011} is an apocalyptic number.

212121122020011 is a deficient number, since it is larger than the sum of its proper divisors (110724169558869).

212121122020011 is a wasteful number, since it uses less digits than its factorization.

212121122020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097785 (or 1097779 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212121122020011 its reverse (110020221121212), we get a palindrome (322141343141223).

The spelling of 212121122020011 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, twenty thousand, eleven".