201021120110021 has 24 divisors (see below), whose sum is σ = 214223564139264. Its totient is φ = 188588330199360.

The previous prime is 201021120109949. The next prime is 201021120110071. The reversal of 201021120110021 is 120011021120102.

It is a de Polignac number, because none of the positive numbers 2^k-201021120110021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021120109978 and 201021120110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021120110071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99078281 + ... + 101086833.

It is an arithmetic number, because the mean of its divisors is an integer number (8925981839136).

Almost surely, 2^{201021120110021} is an apocalyptic number.

It is an amenable number.

201021120110021 is a deficient number, since it is larger than the sum of its proper divisors (13202444029243).

201021120110021 is a wasteful number, since it uses less digits than its factorization.

201021120110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011289 (or 2011270 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201021120110021 its reverse (120011021120102), we get a palindrome (321032141230123).

The spelling of 201021120110021 in words is "two hundred one trillion, twenty-one billion, one hundred twenty million, one hundred ten thousand, twenty-one".