201021111111111 has 16 divisors (see below), whose sum is σ = 275910834705408. Its totient is φ = 130089538231200.

The previous prime is 201021111111109. The next prime is 201021111111143. The reversal of 201021111111111 is 111111111120102.

It is a happy number.

It is not a de Polignac number, because 201021111111111 - 2¹ = 201021111111109 is a prime.

It is a super-2 number, since 2×201021111111111² (a number of 29 digits) contains 22 as substring.

201021111111111 is a modest number, since divided by 11111111 gives 2010211 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021111111151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2100881395 + ... + 2100977076.

It is an arithmetic number, because the mean of its divisors is an integer number (17244427169088).

Almost surely, 2^{201021111111111} is an apocalyptic number.

201021111111111 is a deficient number, since it is larger than the sum of its proper divisors (74889723594297).

201021111111111 is a wasteful number, since it uses less digits than its factorization.

201021111111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201858942.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 201021111111111 its reverse (111111111120102), we get a palindrome (312132222231213).

It can be divided in two parts, 20102 and 1111111111, that multiplied together give a palindrome (22335555553322).

The spelling of 201021111111111 in words is "two hundred one trillion, twenty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".