20101321111 has 16 divisors (see below), whose sum is σ = 21297656160. Its totient is φ = 18919111680.

The previous prime is 20101321091. The next prime is 20101321117. The reversal of 20101321111 is 11112310102.

It is a happy number.

It is not a de Polignac number, because 20101321111 - 2²⁷ = 19967103383 is a prime.

It is a super-2 number, since 2×20101321111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101321091 and 20101321100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101321117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2844895 + ... + 2851951.

It is an arithmetic number, because the mean of its divisors is an integer number (1331103510).

Almost surely, 2^20101321111 is an apocalyptic number.

20101321111 is a deficient number, since it is larger than the sum of its proper divisors (1196335049).

20101321111 is a wasteful number, since it uses less digits than its factorization.

20101321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8034.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20101321111 its reverse (11112310102), we get a palindrome (31213631213).

The spelling of 20101321111 in words is "twenty billion, one hundred one million, three hundred twenty-one thousand, one hundred eleven".