21212111010201 has 8 divisors (see below), whose sum is σ = 29047215077184. Its totient is φ = 13759207141680.

The previous prime is 21212111010193. The next prime is 21212111010203. The reversal of 21212111010201 is 10201011121212.

It is a happy number.

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

It is not a de Polignac number, because 21212111010201 - 2³ = 21212111010193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21212111010203) 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, 95550049485 + ... + 95550049706.

It is an arithmetic number, because the mean of its divisors is an integer number (3630901884648).

Almost surely, 2^{21212111010201} is an apocalyptic number.

It is an amenable number.

21212111010201 is a deficient number, since it is larger than the sum of its proper divisors (7835104066983).

21212111010201 is a wasteful number, since it uses less digits than its factorization.

21212111010201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191100099231.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21212111010201 its reverse (10201011121212), we get a palindrome (31413122131413).

The spelling of 21212111010201 in words is "twenty-one trillion, two hundred twelve billion, one hundred eleven million, ten thousand, two hundred one".