21234526571 has 2 divisors, whose sum is σ = 21234526572. Its totient is φ = 21234526570.

The previous prime is 21234526567. The next prime is 21234526667. The reversal of 21234526571 is 17562543212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21234526571 - 2² = 21234526567 is a prime.

It is not a weakly prime, because it can be changed into another prime (21234526501) 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, 10617263285 + 10617263286.

It is an arithmetic number, because the mean of its divisors is an integer number (10617263286).

Almost surely, 2^21234526571 is an apocalyptic number.

21234526571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234526571 is an equidigital number, since it uses as much as digits as its factorization.

21234526571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The spelling of 21234526571 in words is "twenty-one billion, two hundred thirty-four million, five hundred twenty-six thousand, five hundred seventy-one".