20101331 has 2 divisors, whose sum is σ = 20101332. Its totient is φ = 20101330.

The previous prime is 20101309. The next prime is 20101349. The reversal of 20101331 is 13310102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20101331 - 2¹⁴ = 20084947 is a prime.

It is a super-2 number, since 2×20101331² = 808127015943122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20101351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050665 + 10050666.

It is an arithmetic number, because the mean of its divisors is an integer number (10050666).

Almost surely, 2^20101331 is an apocalyptic number.

20101331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101331 is an equidigital number, since it uses as much as digits as its factorization.

20101331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 20101331 is about 4483.4507915221. The cubic root of 20101331 is about 271.8994140405.

Adding to 20101331 its reverse (13310102), we get a palindrome (33411433).

The spelling of 20101331 in words is "twenty million, one hundred one thousand, three hundred thirty-one".