202020011111 has 4 divisors (see below), whose sum is σ = 202042130352. Its totient is φ = 201997891872.

The previous prime is 202020011101. The next prime is 202020011113. The reversal of 202020011111 is 111110020202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202020011111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202020011092 and 202020011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020011113) 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, 11045915 + ... + 11064188.

It is an arithmetic number, because the mean of its divisors is an integer number (50510532588).

Almost surely, 2^202020011111 is an apocalyptic number.

202020011111 is a deficient number, since it is larger than the sum of its proper divisors (22119241).

202020011111 is an equidigital number, since it uses as much as digits as its factorization.

202020011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22119240.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 202020011111 its reverse (111110020202), we get a palindrome (313130031313).

Subtracting from 202020011111 its reverse (111110020202), we obtain a palindrome (90909990909).

The spelling of 202020011111 in words is "two hundred two billion, twenty million, eleven thousand, one hundred eleven".