20101201111 has 4 divisors (see below), whose sum is σ = 20133675400. Its totient is φ = 20068726824.

The previous prime is 20101201079. The next prime is 20101201121. The reversal of 20101201111 is 11110210102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11110210102 = 2 ⋅5555105051.

It is a cyclic number.

It is not a de Polignac number, because 20101201111 - 2⁵ = 20101201079 is a prime.

It is a super-2 number, since 2×20101201111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101201121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16236216 + ... + 16237453.

It is an arithmetic number, because the mean of its divisors is an integer number (5033418850).

Almost surely, 2^20101201111 is an apocalyptic number.

20101201111 is a deficient number, since it is larger than the sum of its proper divisors (32474289).

20101201111 is an equidigital number, since it uses as much as digits as its factorization.

20101201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32474288.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20101201111 its reverse (11110210102), we get a palindrome (31211411213).

The spelling of 20101201111 in words is "twenty billion, one hundred one million, two hundred one thousand, one hundred eleven".