21130223291 has 2 divisors, whose sum is σ = 21130223292. Its totient is φ = 21130223290.

The previous prime is 21130223237. The next prime is 21130223311. The reversal of 21130223291 is 19232203112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130223291 - 2⁶ = 21130223227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21130223291.

It is not a weakly prime, because it can be changed into another prime (21130223201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565111645 + 10565111646.

It is an arithmetic number, because the mean of its divisors is an integer number (10565111646).

Almost surely, 2^21130223291 is an apocalyptic number.

21130223291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130223291 is an equidigital number, since it uses as much as digits as its factorization.

21130223291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 21130223291 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-three thousand, two hundred ninety-one".