21130023071 has 2 divisors, whose sum is σ = 21130023072. Its totient is φ = 21130023070.

The previous prime is 21130023041. The next prime is 21130023091. The reversal of 21130023071 is 17032003112.

It is an a-pointer prime, because the next prime (21130023091) can be obtained adding 21130023071 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130023071 - 2¹⁰ = 21130022047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130023041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565011535 + 10565011536.

It is an arithmetic number, because the mean of its divisors is an integer number (10565011536).

Almost surely, 2^21130023071 is an apocalyptic number.

21130023071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130023071 is an equidigital number, since it uses as much as digits as its factorization.

21130023071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

Adding to 21130023071 its reverse (17032003112), we get a palindrome (38162026183).

The spelling of 21130023071 in words is "twenty-one billion, one hundred thirty million, twenty-three thousand, seventy-one".