21212012101 has 8 divisors (see below), whose sum is σ = 24806074304. Its totient is φ = 17758893600.

The previous prime is 21212012069. The next prime is 21212012141. The reversal of 21212012101 is 10121021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212012101 - 2⁵ = 21212012069 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 (21212012141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35235600 + ... + 35236201.

It is an arithmetic number, because the mean of its divisors is an integer number (3100759288).

Almost surely, 2^21212012101 is an apocalyptic number.

It is an amenable number.

21212012101 is a deficient number, since it is larger than the sum of its proper divisors (3594062203).

21212012101 is an equidigital number, since it uses as much as digits as its factorization.

21212012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70471851.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212012101 its reverse (10121021212), we get a palindrome (31333033313).

The spelling of 21212012101 in words is "twenty-one billion, two hundred twelve million, twelve thousand, one hundred one".