201021001001111 has 16 divisors (see below), whose sum is σ = 214585259120640. Its totient is φ = 187755261150240.

The previous prime is 201021001001087. The next prime is 201021001001153. The reversal of 201021001001111 is 111100100120102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021001001111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021001001092 and 201021001001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021001001011) 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, 74286266 + ... + 76944728.

It is an arithmetic number, because the mean of its divisors is an integer number (13411578695040).

Almost surely, 2^{201021001001111} is an apocalyptic number.

201021001001111 is a deficient number, since it is larger than the sum of its proper divisors (13564258119529).

201021001001111 is a wasteful number, since it uses less digits than its factorization.

201021001001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714606.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 201021001001111 its reverse (111100100120102), we get a palindrome (312121101121213).

The spelling of 201021001001111 in words is "two hundred one trillion, twenty-one billion, one million, one thousand, one hundred eleven".