21130002331 has 2 divisors, whose sum is σ = 21130002332. Its totient is φ = 21130002330.

The previous prime is 21130002307. The next prime is 21130002367. The reversal of 21130002331 is 13320003112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130002331 is a prime.

It is a super-3 number, since 3×21130002331³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21130002031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565001165 + 10565001166.

It is an arithmetic number, because the mean of its divisors is an integer number (10565001166).

Almost surely, 2^21130002331 is an apocalyptic number.

21130002331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130002331 is an equidigital number, since it uses as much as digits as its factorization.

21130002331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21130002331 its reverse (13320003112), we get a palindrome (34450005443).

The spelling of 21130002331 in words is "twenty-one billion, one hundred thirty million, two thousand, three hundred thirty-one".