201021102111101 has 4 divisors (see below), whose sum is σ = 201021236012604. Its totient is φ = 201020968209600.

The previous prime is 201021102111013. The next prime is 201021102111113. The reversal of 201021102111101 is 101111201120102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66954206328025 + 134066895783076 = 8182555^2 + 11578726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021102111101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021102114101) 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, 64673030 + ... + 67709991.

It is an arithmetic number, because the mean of its divisors is an integer number (50255309003151).

Almost surely, 2^{201021102111101} is an apocalyptic number.

It is an amenable number.

201021102111101 is a deficient number, since it is larger than the sum of its proper divisors (133901503).

201021102111101 is a wasteful number, since it uses less digits than its factorization.

201021102111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133901502.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 201021102111101 its reverse (101111201120102), we get a palindrome (302132303231203).

Subtracting from 201021102111101 its reverse (101111201120102), we obtain a palindrome (99909900990999).

The spelling of 201021102111101 in words is "two hundred one trillion, twenty-one billion, one hundred two million, one hundred eleven thousand, one hundred one".