21212201211121 has 8 divisors (see below), whose sum is σ = 21574598962688. Its totient is φ = 20850276258000.

The previous prime is 21212201211067. The next prime is 21212201211163. The reversal of 21212201211121 is 12111210221212.

It is a happy number.

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 21212201211121 - 2²⁷ = 21212066993393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212201211221) 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, 118109115 + ... + 118288576.

It is an arithmetic number, because the mean of its divisors is an integer number (2696824870336).

Almost surely, 2^{21212201211121} is an apocalyptic number.

It is an amenable number.

21212201211121 is a deficient number, since it is larger than the sum of its proper divisors (362397751567).

21212201211121 is a wasteful number, since it uses less digits than its factorization.

21212201211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236399223.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21212201211121 its reverse (12111210221212), we get a palindrome (33323411432333).

The spelling of 21212201211121 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred eleven thousand, one hundred twenty-one".