21130302091 has 2 divisors, whose sum is σ = 21130302092. Its totient is φ = 21130302090.

The previous prime is 21130302049. The next prime is 21130302163. The reversal of 21130302091 is 19020303112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21130302091 - 2¹¹ = 21130300043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130308091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565151045 + 10565151046.

It is an arithmetic number, because the mean of its divisors is an integer number (10565151046).

Almost surely, 2^21130302091 is an apocalyptic number.

21130302091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130302091 is an equidigital number, since it uses as much as digits as its factorization.

21130302091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21130302091 in words is "twenty-one billion, one hundred thirty million, three hundred two thousand, ninety-one".