201021311101 has 4 divisors (see below), whose sum is σ = 216484488892. Its totient is φ = 185558133312.

The previous prime is 201021311047. The next prime is 201021311123. The reversal of 201021311101 is 101113120102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101113120102 = 2 ⋅50556560051.

It can be written as a sum of positive squares in 2 ways, for example, as 32860625625 + 168160685476 = 181275^2 + 410074^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021311101 - 2³³ = 192431376509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15463177777 = 201021311101 / (2 + 0 + 1 + 0 + 2 + 1 + 3 + 1 + 1 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021312101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7731588876 + ... + 7731588901.

It is an arithmetic number, because the mean of its divisors is an integer number (54121122223).

Almost surely, 2^201021311101 is an apocalyptic number.

It is an amenable number.

201021311101 is a deficient number, since it is larger than the sum of its proper divisors (15463177791).

201021311101 is a wasteful number, since it uses less digits than its factorization.

201021311101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15463177790.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 201021311101 its reverse (101113120102), we get a palindrome (302134431203).

The spelling of 201021311101 in words is "two hundred one billion, twenty-one million, three hundred eleven thousand, one hundred one".