20101331311 has 4 divisors (see below), whose sum is σ = 20104113832. Its totient is φ = 20098548792.

The previous prime is 20101331309. The next prime is 20101331317. The reversal of 20101331311 is 11313310102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11313310102 = 2 ⋅5656655051.

It is a cyclic number.

It is not a de Polignac number, because 20101331311 - 2¹ = 20101331309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101331317) 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, 1380396 + ... + 1394881.

It is an arithmetic number, because the mean of its divisors is an integer number (5026028458).

Almost surely, 2^20101331311 is an apocalyptic number.

20101331311 is a deficient number, since it is larger than the sum of its proper divisors (2782521).

20101331311 is an equidigital number, since it uses as much as digits as its factorization.

20101331311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782520.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 20101331311 its reverse (11313310102), we get a palindrome (31414641413).

It can be divided in two parts, 201013 and 31311, that added together give a square (232324 = 482²).

The spelling of 20101331311 in words is "twenty billion, one hundred one million, three hundred thirty-one thousand, three hundred eleven".