20101202111 has 4 divisors (see below), whose sum is σ = 20247926352. Its totient is φ = 19954477872.

The previous prime is 20101202053. The next prime is 20101202117. The reversal of 20101202111 is 11120210102.

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

It is a cyclic number.

It is not a de Polignac number, because 20101202111 - 2³⁴ = 2921332927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101202092 and 20101202101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101202117) 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, 73361915 + ... + 73362188.

It is an arithmetic number, because the mean of its divisors is an integer number (5061981588).

Almost surely, 2^20101202111 is an apocalyptic number.

20101202111 is a deficient number, since it is larger than the sum of its proper divisors (146724241).

20101202111 is a wasteful number, since it uses less digits than its factorization.

20101202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146724240.

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

Adding to 20101202111 its reverse (11120210102), we get a palindrome (31221412213).

The spelling of 20101202111 in words is "twenty billion, one hundred one million, two hundred two thousand, one hundred eleven".