21212212021101 has 8 divisors (see below), whose sum is σ = 31425499290560. Its totient is φ = 14141474680716.

The previous prime is 21212212021001. The next prime is 21212212021151. The reversal of 21212212021101 is 10112021221212.

21212212021101 is a `hidden beast` number, since 212 + 1 + 221 + 20 + 211 + 0 + 1 = 666.

It is not a de Polignac number, because 21212212021101 - 2⁷ = 21212212020973 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 (21212212021151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392818741105 + ... + 392818741158.

It is an arithmetic number, because the mean of its divisors is an integer number (3928187411320).

Almost surely, 2^{21212212021101} is an apocalyptic number.

It is an amenable number.

21212212021101 is a deficient number, since it is larger than the sum of its proper divisors (10213287269459).

21212212021101 is an equidigital number, since it uses as much as digits as its factorization.

21212212021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785637482272 (or 785637482266 counting only the distinct ones).

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

Adding to 21212212021101 its reverse (10112021221212), we get a palindrome (31324233242313).

The spelling of 21212212021101 in words is "twenty-one trillion, two hundred twelve billion, two hundred twelve million, twenty-one thousand, one hundred one".