21130342087 has 2 divisors, whose sum is σ = 21130342088. Its totient is φ = 21130342086.

The previous prime is 21130342061. The next prime is 21130342091. The reversal of 21130342087 is 78024303112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130342087 - 2³¹ = 18982858439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130342097) 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, 10565171043 + 10565171044.

It is an arithmetic number, because the mean of its divisors is an integer number (10565171044).

Almost surely, 2^21130342087 is an apocalyptic number.

21130342087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130342087 is an equidigital number, since it uses as much as digits as its factorization.

21130342087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 21130342087 its reverse (78024303112), we get a palindrome (99154645199).

The spelling of 21130342087 in words is "twenty-one billion, one hundred thirty million, three hundred forty-two thousand, eighty-seven".