21001212100101 has 8 divisors (see below), whose sum is σ = 29648770023744. Its totient is φ = 13177231121600.

The previous prime is 21001212100093. The next prime is 21001212100151. The reversal of 21001212100101 is 10100121210012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001212100101 - 2³ = 21001212100093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001212100151) 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 7 ways as a sum of consecutive naturals, for example, 205894236225 + ... + 205894236326.

It is an arithmetic number, because the mean of its divisors is an integer number (3706096252968).

Almost surely, 2^{21001212100101} is an apocalyptic number.

It is an amenable number.

21001212100101 is a deficient number, since it is larger than the sum of its proper divisors (8647557923643).

21001212100101 is a wasteful number, since it uses less digits than its factorization.

21001212100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411788472571.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001212100101 its reverse (10100121210012), we get a palindrome (31101333310113).

The spelling of 21001212100101 in words is "twenty-one trillion, one billion, two hundred twelve million, one hundred thousand, one hundred one".