21210201110121 has 8 divisors (see below), whose sum is σ = 28290250603680. Its totient is φ = 14135142844992.

The previous prime is 21210201110107. The next prime is 21210201110167. The reversal of 21210201110121 is 12101110201212.

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 21210201110121 - 2⁹ = 21210201109609 is a prime.

It is a super-2 number, since 2×21210201110121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210201110121.

It is not an unprimeable number, because it can be changed into a prime (21210201114121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1247797191 + ... + 1247814188.

It is an arithmetic number, because the mean of its divisors is an integer number (3536281325460).

Almost surely, 2^{21210201110121} is an apocalyptic number.

It is an amenable number.

21210201110121 is a deficient number, since it is larger than the sum of its proper divisors (7080049493559).

21210201110121 is a wasteful number, since it uses less digits than its factorization.

21210201110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495614215.

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

Adding to 21210201110121 its reverse (12101110201212), we get a palindrome (33311311311333).

The spelling of 21210201110121 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, one hundred ten thousand, one hundred twenty-one".