21131301331 has 4 divisors (see below), whose sum is σ = 24150058672. Its totient is φ = 18112543992.

The previous prime is 21131301329. The next prime is 21131301349. The reversal of 21131301331 is 13310313112.

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 21131301331 - 2¹ = 21131301329 is a prime.

It is a super-2 number, since 2×21131301331² (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 = 21131301299 and 21131301308.

It is not an unprimeable number, because it can be changed into a prime (21131301131) 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 3 ways as a sum of consecutive naturals, for example, 1509378660 + ... + 1509378673.

It is an arithmetic number, because the mean of its divisors is an integer number (6037514668).

Almost surely, 2^21131301331 is an apocalyptic number.

21131301331 is a deficient number, since it is larger than the sum of its proper divisors (3018757341).

21131301331 is an equidigital number, since it uses as much as digits as its factorization.

21131301331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018757340.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21131301331 its reverse (13310313112), we get a palindrome (34441614443).

The spelling of 21131301331 in words is "twenty-one billion, one hundred thirty-one million, three hundred one thousand, three hundred thirty-one".