21212132113201 has 4 divisors (see below), whose sum is σ = 21292786608192. Its totient is φ = 21131477618212.

The previous prime is 21212132113169. The next prime is 21212132113217. The reversal of 21212132113201 is 10231123121212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21212132113201 - 2⁵ = 21212132113169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212132113231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40327247101 + ... + 40327247626.

It is an arithmetic number, because the mean of its divisors is an integer number (5323196652048).

Almost surely, 2^{21212132113201} is an apocalyptic number.

It is an amenable number.

21212132113201 is a deficient number, since it is larger than the sum of its proper divisors (80654494991).

21212132113201 is an equidigital number, since it uses as much as digits as its factorization.

21212132113201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80654494990.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21212132113201 its reverse (10231123121212), we get a palindrome (31443255234413).

The spelling of 21212132113201 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirty-two million, one hundred thirteen thousand, two hundred one".