211020102111111 has 64 divisors (see below), whose sum is σ = 299395202365440. Its totient is φ = 132034912289280.

The previous prime is 211020102111109. The next prime is 211020102111139. The reversal of 211020102111111 is 111111201020112.

It is not a de Polignac number, because 211020102111111 - 2¹ = 211020102111109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020102111101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149248161 + ... + 150655413.

It is an arithmetic number, because the mean of its divisors is an integer number (4678050036960).

Almost surely, 2^{211020102111111} is an apocalyptic number.

211020102111111 is a deficient number, since it is larger than the sum of its proper divisors (88375100254329).

211020102111111 is a wasteful number, since it uses less digits than its factorization.

211020102111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407776.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 211020102111111 its reverse (111111201020112), we get a palindrome (322131303131223).

The spelling of 211020102111111 in words is "two hundred eleven trillion, twenty billion, one hundred two million, one hundred eleven thousand, one hundred eleven".